cíu
( x - 2 ) (x2+ 2x + 4 )+ 2(x2- 4)- 5x( x - 2) = 0
`(x- 2)(x^2 + 2x + 4) + 2(x^2 - 4) - 5x(x - 2) = 0`
`(x - 2)(x^2 + 2x + 4) + 2(x - 2)(x + 2) - 5x(x - 2) = 0`
`(x - 2)[x^2 + 2x + 4 + 2(x + 2) - 5x] = 0`
`(x - 2)(x^2 + 2x + 4 + 2x + 4 - 5x) = 0`
`(x - 2)(x^2 - x + 8) = 0`
`x - 2 = 0 (` Mà `x^2 - x + 8 \ne 0)`
`x = 0 + 2`
`x = 2`
Vậy: `x=2`
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(x−2)(x2+2x+4)+2(x2 −4)−5x(x−2)=0(x-2)(x2+2x+4)+2(x2 -4)-5x(x-2)=0
(x−2)(x2+2x+4)+2(x−2)(x+2)−5x(x−2)=0(x-2)(x2+2x+4)+2(x-2)(x+2)-5x(x-2)=0
(x−2)[x2+2x+4+2(x+2)−5x]=0(x-2)[x2+2x+4+2(x+2)-5x]=0
(x−2)(x2+2x+4+2x+4−5x)=0
Vậy x ta tìm được=2 (x2 là x mũ 2,tui ko viết được số mũ)
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Trong cuộc sống, có những người khuyết tật những vẫn có nhiều đóng góp ý nghĩa cho xã hội, cộng đồng như diễn giả nổi tiếng thế giới Nick Vujicic, nhà văn Helen Keller, hiệp sí công nghệ thông tin - Nguyễn Công Hùng, cô gái "xương thủy tinh" Nguyễn Phương Anh.... Câu chuyện của những người như vậy giúp lan tỏa trong em những giá trị sống như thế nào
Câu chuyện của những người như Nick Vujicic, Helen Keller, Nguyễn Công Hùng và Nguyễn Phương Anh giúp em nhận ra rằng, dù gặp khó khăn hay khiếm khuyết, chúng ta vẫn có thể vượt qua và đóng góp cho xã hội. Họ dạy em về sự kiên cường, nghị lực và không bao giờ từ bỏ ước mơ. Em cũng học được sự đồng cảm, tôn trọng đối với những người khuyết tật, và tin rằng mỗi người đều có thể làm những điều tuyệt vời nếu nỗ lực.
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(x-5)(x+5)-(x+3)^2=(x+1)^2-(x+4)(x-4)
tìm x
\(\left(x-5\right)\left(x+5\right)-\left(x+3\right)^2=\left(x+1\right)^2-\left(x+4\right)\left(x-4\right)\)
\(\Leftrightarrow x^2-25-x^2-6x-9=x^2-2x+1-x^2+16\)
\(\Leftrightarrow-4x=51\)
\(\Leftrightarrow x=-\dfrac{51}{4}\)
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`(x - 5)(x + 5) - (x + 3)^2 = (x + 1)^2 - (x + 4)(x - 4)`
`x^2 - 25 - (x^2 + 6x+ 9) = x^2 + 2x + 1 - (x^2 - 16)`
`x^2 - 25 - x^2 - 6x - 9 = x^2 + 2x + 1 - x^2 + 16`
`-6x - 34 = 2x + 17`
`-6x - 2x = 17 + 34`
`-8x = 51`
`x = -51/8`
Vậy: `x = -51/8`
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D. WRITINGMark the letter A, B, C or D to indicate the correct answer to each of the following questions. 59. Put the sentences (a-c) in the correct order, then fill in the blank to make a logical text. Our family vacation included visiting several countries and learning about their cultures. Heres what we did.....a. In each country, we visited museums, tried local foods, and attended cultural events.b. We planned our trip to include different countries with rich cultural histories.c. We took lo...
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D. WRITING
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
59. Put the sentences (a-c) in the correct order, then fill in the blank to make a logical text.
Our family vacation included visiting several countries and learning about their cultures. Here's what we did.....
a. In each country, we visited museums, tried local foods, and attended cultural events.
b. We planned our trip to include different countries with rich cultural histories.
c. We took lots of photos and enjoyed learning about the unique traditions and customs of each place.
A. a-b-c B. b-a-c C. c-a-b D. a-c-b
60. Choose the sentence that most appropriately ends the text.
A. We collected souvenirs from each country to remember our trip.
B. We met many local people and learned interesting facts about their daily lives.
C. The trip was an amazing experience, and we gained a deeper understanding of world cultures.
D. We spent a lot of time planning our next vacation to explore even more countries.
Complete the sentences with suitable forms of the words given in the brackets.
61. It is not easy to do these exercises unless you listen attentively to the teacher. (If)
➔ _____________________________________________________
62. If you get enough sleep, you will stay healthy. (Unless)
➔ _____________________________________________________
63. People should be fully aware of their personal identity or they will easily lose their motivation in life. (Unless)
➔ _____________________________________________________
64. Unless you do this now, you will regret it. (If)
➔ ______________________________________________________
65. I will feel bored if my best friend doesn't come to the party with me. (Unless)
➔ _______________________________________________________
Make questions for the underlined words.
66. The Elephant Race Festival is usually held in Don Village.
➔ ________________________________________________________
67. Thirteen elephants joined the elephant race on March 12 in Lak District.
➔ ______________________________________________________
68. The Perfume Pagoda is about 70 kilometers away from Hanoi.
➔ ______________________________________________________
69. The Tay don't allow guests to sit in the room of their altar because that room is such a sacred place.
➔ ______________________________________________________
70. Some ethnic groups lived a semi-nomadic life decades ago.
➔ ______________________________________________________
Write in full sentences using the given words.
71. Martial arts/ originate/ the East.
→_____________________________________________________________
72. Young rice cake/ a specialty/ this area.
→_______________________________________________________
73. You should/learn/ Vietnamese table manners/ part/ Vietnamese culture.
→____________________________________________________________
74. We/ have/ a family/ reunion/ next week.
→______________________________________________________________
75. If Sarah / not be / ready / by 8 a.m /I/go/without her.
→______________________________________________________
76. He/learn/quickly / if/ he / practice / frequently.
→_____________________________________________________________
77. They/ not miss / the flight/ if they/be/ in a hurry.
→_____________________________________________________________
Complete the sentences with suitable forms of the words given in the brackets.
61. It is not easy to do these exercises unless you listen attentively to the teacher. (If)
➔ If you don’t listen attentively to the teacher, it will not be easy to do these exercises.
62. If you get enough sleep, you will stay healthy. (Unless)
➔ Unless you get enough sleep, you won’t stay healthy.
63. People should be fully aware of their personal identity or they will easily lose their motivation in life. (Unless)
➔ Unless people are fully aware of their personal identity, they will easily lose their motivation in life.
64. Unless you do this now, you will regret it. (If)
➔ If you don’t do this now, you will regret it.
65. I will feel bored if my best friend doesn't come to the party with me. (Unless)
➔ Unless my best friend comes to the party with me, I will feel bored.
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Make questions for the underlined words.
66. The Elephant Race Festival is usually held in Don Village.
➔ Where is the Elephant Race Festival usually held?
67. Thirteen elephants joined the elephant race on March 12 in Lak District.
➔ How many elephants joined the elephant race on March 12 in Lak District?
68. The Perfume Pagoda is about 70 kilometers away from Hanoi.
➔ How far is the Perfume Pagoda from Hanoi?
69. The Tay don't allow guests to sit in the room of their altar because that room is such a sacred place.
➔ Why don’t the Tay allow guests to sit in the room of their altar?
70. Some ethnic groups lived a semi-nomadic life decades ago.
➔ How did some ethnic groups live decades ago?
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Write in full sentences using the given words.
71. Martial arts/ originate/ the East.
➔ Martial arts originated in the East.
72. Young rice cake/ a specialty/ this area.
➔ Young rice cake is a specialty of this area.
73. You should/learn/ Vietnamese table manners/ part/ Vietnamese culture.
➔ You should learn Vietnamese table manners as part of Vietnamese culture.
74. We/ have/ a family/ reunion/ next week.
➔ We will have a family reunion next week.
75. If Sarah / not be / ready / by 8 a.m /I/go/without her.
➔ If Sarah is not ready by 8 a.m, I will go without her.
76. He/learn/quickly / if/ he / practice / frequently.
➔ He will learn quickly if he practices frequently.
77. They/ not miss / the flight/ if they/be/ in a hurry.
➔ They will not miss the flight if they are in a hurry.
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TÌm x:
\(x^3-4x^3=-4x\)
Ta có: \(x^3-4x^3=-4x\)
=>\(-3x^3=-4x\)
=>\(3x^3=4x\)
=>\(3x^3-4x=0\)
=>\(x\left(3x^2-4\right)=0\)
=>\(\left[{}\begin{matrix}x=0\\3x^2-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x^2=\dfrac{4}{3}\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=0\\x=\dfrac{2\sqrt{3}}{3}\\x=-\dfrac{2\sqrt{3}}{3}\end{matrix}\right.\)
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C. READINGLook at the signs. Choose the best answer for the question.42. What does this sign mean?Max,Theres a problem with the shower. You cant use it unless you want a cold one! Someones coming to fix it this afternoon, so itll be OK tomorrow.MumA. Max can take a hot shower now.B. Max can only have hot shower tomorrow.C. Mum needs Max to fix the shower.D. Someone helped Max fix the shower.43.A. You should not talk in this place. B. You cannot bring your phone inside. C. You can only talk on...
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C. READING
Look at the signs. Choose the best answer for the question.
42. What does this sign mean?
Max, There's a problem with the shower. You can't use it unless you want a cold one! Someone's coming to fix it this afternoon, so it'll be OK tomorrow. Mum | A. Max can take a hot shower now. B. Max can only have hot shower tomorrow. C. Mum needs Max to fix the shower. D. Someone helped Max fix the shower. |
43.
| A. You should not talk in this place. B. You cannot bring your phone inside. C. You can only talk on your phone here. D. You can talk unless you go outside. |
Read the following passage and circle the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks.
Communal House (Rong House)
The Rong House can only be (44)____ in villages to the north of the Central Highlands, especially in Gia Lai and Kon Tum provinces. It is a large, imposing, beautifully decorated stilt house built (45) ____ the middle of the village. It is where community activities (46) ____, meetings, wedding ceremonies, or praying ceremonies. It is also the place for reception of guests. The Rong House of each ethnic group has its own architectural style, design, and decor, yet it shares some (47)____. In the village, it is often (48)____house roofed with patterns of bright colours, depicting big wood columns.
44. A. found B. finding C. to find D. find
45. A. in B. at C. on D. under
46. A. take on B. take place C. occurs D. happens
47. A. cultures B. features C. customs D. designs
48. A. a biggers B. a big C. biggest D. the biggest
Read the following passage and circle the letter A, B, C, or D to indicate the correct answer to each of the questions.
Although there are various wedding styles in America, most weddings still follow certain traditions. One of those is an old saying that dates back to 19th century England about what a bride should wear or carry: "Something old, something new, something borrowed, something blue." A bride wears something old to remind her of her family and the past. Some brides wear their mother's wedding dress or a piece of her jewelry. Something new means good luck and hope for a happy future with her new husband. Again, this item may be the dress, but often it is a pair of new shoes. Something borrowed such as a friend's handkerchief or a married friend's bridal veil means the bride has friends and family who are willing to help her. Something blue is a symbol of trust and faith between the couple. These days, some brides are creative with this item by painting their fingernails a light blue color or wearing a garter on their leg. Another tradition says that the groom should take the garter after the ceremony and throw it to the single men. The man who catches it will be the next one to get married.
49. What is the text mainly about?
A. Various types of weddings.
B. Wedding traditions and their meaning.
C. What should be worn on your wedding day.
D. How to plan a traditional wedding
50. To remind her of the past, the bridge might _____________
A. wear a pair of new shoes. B. carry a friend's handkerchief.
C. wear her mother's wedding dress. D. paint her fingernails a light blue color.
51. The word "it" in line 6 refers to _____________.
A. a pair of shoes B. luck C. item D. future
52. The word "willing" in paragraph 2 is CLOSEST in meaning to _____________.
A. reluctant B. pleased C. unhappy D. careful
53. Why do some brides wear a blue garter on their leg?
A. Because too many brides paint their fingernails a light blur color.
B. Because it is a symbol of trust and faith between the bride and the groom.
C. To show how the couple can be lucky in their marriage.
D. To show how popular something blur is in a wedding.
54. The word "faith" in paragraph 2 is OPPOSITE in meaning to _____________.
A. lotalty B. belief C. disbelief D. hope
Four phrases/sentences have been removed from the text below. For each question, mark the letter A, B, C, or to indicate the correct option that best fits each of the numbered blanks.
Vu Lan Festival takes place on the 15th of the seventh lunar month. (55)______. Vietnamese people consider that it is an occasion for family gatherings as well as expressing love and gratitude to ancestors and parents. Vu Lan festival is known as Mother's Day in Viet Nam. (56) ____,a lavish tray with various offering food is set on the altar, and the householder will bum incense and invite ancestors to come back home and celebrate with family. Then, at night the Vietnamese hold a ceremony of releasing lighted lanterns on the river, (57) ______ They also go to the pagoda, (58) _____ if their mothers are still alive or white roses if their mothers passed away.
A. Wearing either a red rose
B. First, in the morning of that day
C. It is one of the largest festivals of Viet Nam
D. They believe by doing that their wishes for their parents will come true
42 C
Read the following passage and circle the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks.
Communal House (Rong House)
The Rong House can only be (44)____ in villages to the north of the Central Highlands, especially in Gia Lai and Kon Tum provinces. It is a large, imposing, beautifully decorated stilt house built (45) ____ the middle of the village. It is where community activities (46) ____, meetings, wedding ceremonies, or praying ceremonies. It is also the place for reception of guests. The Rong House of each ethnic group has its own architectural style, design, and decor, yet it shares some (47)____. In the village, it is often (48)____house roofed with patterns of bright colours, depicting big wood columns.
44. A. found B. finding C. to find D. find
45. A. in B. at C. on D. under
46. A. take on B. take place C. occurs D. happens
47. A. cultures B. features C. customs D. designs
48. A. a biggers B. a big C. biggest D. the biggest
Read the following passage and circle the letter A, B, C, or D to indicate the correct answer to each of the questions.
Although there are various wedding styles in America, most weddings still follow certain traditions. One of those is an old saying that dates back to 19th century England about what a bride should wear or carry: "Something old, something new, something borrowed, something blue." A bride wears something old to remind her of her family and the past. Some brides wear their mother's wedding dress or a piece of her jewelry. Something new means good luck and hope for a happy future with her new husband. Again, this item may be the dress, but often it is a pair of new shoes. Something borrowed such as a friend's handkerchief or a married friend's bridal veil means the bride has friends and family who are willing to help her. Something blue is a symbol of trust and faith between the couple. These days, some brides are creative with this item by painting their fingernails a light blue color or wearing a garter on their leg. Another tradition says that the groom should take the garter after the ceremony and throw it to the single men. The man who catches it will be the next one to get married.
49. What is the text mainly about?
A. Various types of weddings.
B. Wedding traditions and their meaning.
C. What should be worn on your wedding day.
D. How to plan a traditional wedding
50. To remind her of the past, the bridge might _____________
A. wear a pair of new shoes. B. carry a friend's handkerchief.
C. wear her mother's wedding dress. D. paint her fingernails a light blue color.
51. The word "it" in line 6 refers to _____________.
A. a pair of shoes B. luck C. item D. future
52. The word "willing" in paragraph 2 is CLOSEST in meaning to _____________.
A. reluctant B. pleased C. unhappy D. careful
53. Why do some brides wear a blue garter on their leg?
A. Because too many brides paint their fingernails a light blur color.
B. Because it is a symbol of trust and faith between the bride and the groom.
C. To show how the couple can be lucky in their marriage.
D. To show how popular something blur is in a wedding.
54. The word "faith" in paragraph 2 is OPPOSITE in meaning to _____________.
A. lotalty B. belief C. disbelief D. hope
Four phrases/sentences have been removed from the text below. For each question, mark the letter A, B, C, or to indicate the correct option that best fits each of the numbered blanks.
Vu Lan Festival takes place on the 15th of the seventh lunar month. (55)____C__. Vietnamese people consider that it is an occasion for family gatherings as well as expressing love and gratitude to ancestors and parents. Vu Lan festival is known as Mother's Day in Viet Nam. (56) __B__,a lavish tray with various offering food is set on the altar, and the householder will bum incense and invite ancestors to come back home and celebrate with family. Then, at night the Vietnamese hold a ceremony of releasing lighted lanterns on the river, (57) ____A__ They also go to the pagoda, (58) _D____ if their mothers are still alive or white roses if their mothers passed away.
A. Wearing either a red rose
B. First, in the morning of that day
C. It is one of the largest festivals of Viet Nam
D. They believe by doing that their wishes for their parents will come true
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B. VOCABULARY AND GRAMMARChoose the word/ phrase/ sentence (A, B, C, or D) that best fits the space in each sentence or best answers the question.11. ________ is the population of the Jrai? Its 513,930 (2019) A. Which B. Who C. What D. How12.- ________ do you hold a family reunion? On the first day of Tet A. When B. Who C. What D. How13. ________can you find terraced fie...
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B. VOCABULARY AND GRAMMAR
Choose the word/ phrase/ sentence (A, B, C, or D) that best fits the space in each sentence or best answers the question.
11. ________ is the population of the Jrai? It's 513,930 (2019)
A. Which B. Who C. What D. How
12.- ________ do you hold a family reunion? On the first day of Tet
A. When B. Who C. What D. How
13. ________can you find terraced fields? - In Sapa.
A. Which B. Who C. Where D. How
14. ________ethnic groups are there in Vietnam? 54
A. How often B. How many C. How much D. How long
15. ________colours like blue and yellow can make people feel happy.
A. A lot B. Any C. Some D. A
16. I always ________ my parents had a long and happy life.
A. make B. wish C. celebrate D. have
17. I don't have ________homework to do at Tet.
A. a little B. many C. a D. any
18. The first person to visit our home at Tet is the ________.
A. newcomer B. first footer C. stranger D. neighbour
19. ________do they buy ornament trees and flowers? For decorations and offerings
A. What B. Why C. When D. How
20. It is considered to be________ to turn up for dinner on time in Tanzania, you should be 15 minutes late
A. rude B. polite C. modern D. suitable
21. It is typical of the culture life of ________Thai people.
A. some B. a C. the D. an
22. Viet Nam ________Tet according to the lunar calendar.
A. decorates B. celebrates C. makes D. does
23. Would your sister like ________to make banh chung?
A. to learn B. learning C. learn D. learns
24. My grandma will cook banh chung- our special ________at Tet.
A. flower B. meal C. food D. sweets
25. Learning ________can help build physical strength and improve confidence.
A. physics B. lesson C. martial arts D. chemistry
26. If you work hard all night, you ________very tired tomorrow
A. are B. were C. will be D. would be
27. There'll always be a conflict between ________old and ________ young.
A. the- the B. an-a C. an- the D. the- a
28. We will have an occasion to visit our ________during Tet.
A neighbours B. teachers C. relatives D. friends
29. In Viet Nam, Tet is a good time for family _______.
A. cookings B. preparings C. gatherings D. sayings
30. Lunar New Year, or Tet, is the longest _______in Viet Nam.
A. activity B. holiday C. ceremony D. anniversary
Choose the word or phrase (A, B, C, or D) that best completes each of the following exchanges.
31. Nga invites Hoa to play chess.
- Nga: How about playing a game of chess? - Hoa: “_______”
A. Chess is interesting B. No, it's a waste of time
C. Yes, I'd love to D. No, don't ask me to do this
32. - Nam: "Can I borrow your bike for an hour?" - Mr. Thanh: “_______”
A. Yes, certainly! B. Never mind.
C. Well done! D. You're welcome.
Read the following announcement and mark the letter A, B, C or D to indicate the correct option that best fits each numbered blank.
STAYING HEALTHY AT WORK To stay healthy while working, try these easy tips: 1. Take breaks to stand up and (33)........... around. 2. Drink (34).......... water to stay healthy.ad 3. (35)............your desk clean and tidy to feel better. 4. If you feel tired, (36)......some deep breaths to feel relaxed. |
33. A. move B. come C. leave D. look
34. A. many B. enough C. little D. plenty
35. A. Forget B. Open C. Keep D. Hide
36. A. take B. stop C. wait D. run
Good morning, everyone!
We are excited to announce that this Friday, our school will organize (37)........... special event to celebrate and learn more about our (38) .......... and traditions. During the event, students will have the chance to (39) .......... in fun activities like wearing traditional costumes, tasting local food, and performing cultural dances.
Please (40)..........sure to arrive on time and wear your uniform. The event will start at 8:00 AM in the school auditorium. Let's all (41)........... hands to preserve and respect our beautiful traditions!
37. A. an B. a C. the D. x
38. A. habit B. languages C. customs D. places
39. A. take place B. arrive C. participate D. attend
40. A. made B. making C. to make D. make
41. A. join B. collect C. show D. help
11C 12A 13C 14B 15C
16B 17D 18B 19B 20A
21C 22B 23A 24C 25C
26C 27A 28C 29C 30B
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11. ________ is the population of the Jrai? It's 513,930 (2019)
A. Which B. Who C. What D. How
12.- ________ do you hold a family reunion? On the first day of Tet
A. When B. Who C. What D. How
13. ________can you find terraced fields? - In Sapa.
A. Which B. Who C. Where D. How
14. ________ethnic groups are there in Vietnam? 54
A. How often B. How many C. How much D. How long
15. ________colours like blue and yellow can make people feel happy.
A. A lot B. Any C. Some D. A
16. I always ________ my parents had a long and happy life.
A. make B. wish C. celebrate D. have
17. I don't have ________homework to do at Tet.
A. a little B. many C. a D. any
18. The first person to visit our home at Tet is the ________.
A. newcomer B. first footer C. stranger D. neighbour
19. ________do they buy ornament trees and flowers? For decorations and offerings
A. What B. Why C. When D. How
20. It is considered to be________ to turn up for dinner on time in Tanzania, you should be 15 minutes late
A. rude B. polite C. modern D. suitable
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21. It is typical of the culture life of ________Thai people.
A. some B. a C. the D. an
22. Viet Nam ________Tet according to the lunar calendar.
A. decorates B. celebrates C. makes D. does
23. Would your sister like ________to make banh chung?
A. to learn B. learning C. learn D. learns
24. My grandma will cook banh chung- our special ________at Tet.
A. flower B. meal C. food D. sweets
25. Learning ________can help build physical strength and improve confidence.
A. physics B. lesson C. martial arts D. chemistry
26. If you work hard all night, you ________very tired tomorrow
A. are B. were C. will be D. would be
27. There'll always be a conflict between ________old and ________ young.
A. the- the B. an-a C. an- the D. the- a
28. We will have an occasion to visit our ________during Tet.
A neighbours B. teachers C. relatives D. friends
29. In Viet Nam, Tet is a good time for family _______.
A. cookings B. preparings C. gatherings D. sayings
30. Lunar New Year, or Tet, is the longest _______in Viet Nam.
A. activity B. holiday C. ceremony D. anniversary
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A. PRONUNCIATIONMark the letter A, B, C, or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.1. A. center B. culture C. community D. ethnic2. A. village B. gong C. garden D. gathering3. A. singer B. England C. longevity D. offering4. A. browse ...
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A. PRONUNCIATION
Mark the letter A, B, C, or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
1. A. center B. culture C. community D. ethnic
2. A. village B. gong C. garden D. gathering
3. A. singer B. England C. longevity D. offering
4. A. browse B. bridge C. climb D. broccoli
5. A. minority B. tribal C. online D. practice
Mark the letter A, B, C, or D to indicate the word whose stress pattern is different from that of the others.
6. A. tradition B. magician C. important D. otherwise
7. A. performance B. nevertheless C. however D. behaviour
8. A. preserve B. fortune C. ritual D. lantern
9. A. reunion B. bamboo C. festival D. display
10. A. participate B. lifestyle C. communicate D. commemorate
PRONUNCIATION
1.A. center
2.B. gong
3.C. longevity
4.D. broccoli
5.C. online
STRESS PATTERN
6.C. important
7.D. behaviour
8.B. fortune
9.B. bamboo
10.B. lifestyle
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Một khối gỗ hình lập phương có cạnh 50cm,có khối lượng 25kg
a,Tính khối lượng riêng của khối gỗ
b,ngta khoét ở giữa khối gỗ 1 cái lỗ hình lập phương có cạnh 5cm rồi nhét đầy chì vào đó.Tính khối lượng riêng của khối gỗ khi đó
a. thể tích khối gỗ hình lập phương là:
V = a x a x a = 50 x 50 x 50 = 125000 (cm3) = 0,125 m3
khối lượng riêng khối gỗ là:
D = m/V = 25/0,125 = 200 (kg/m3)
b. khối lượng riêng của gỗ ko thay đổi
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a: Xét ΔIAM và ΔICN có
\(\widehat{IAM}=\widehat{ICN}\)(hai góc so le trong, AB//CD)
AM=CN
\(\widehat{IMA}=\widehat{INC}\)(hai góc so le trong, AB//CD)
Do đó: ΔIAM=ΔICN
b: Xét tứ giác AMCN có
AM//CN
AM=CN
Do đó: AMCN là hình bình hành
c: ta có: ΔIAM=ΔICN
=>IA=IC
=>I là trung điểm của AC
ABCD là hình bình hành
=>AC cắt BD tại trung điểm của mỗi đường
mà I là trung điểm của AC
nên I là trung điểm của BD
=>B,I,D thẳng hàng
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