Dạo này mét vắng quá ông nào rảnh ib fb hông nekk^-^
Chán quá dạo này mk không kiếm được SP nào cả
mik cũng thế . chả có câu nào dễ để trả lời cả
Cậu đang dùng olm mới hay cũ đấy
cũ , tớ ghét cái mới
có ai rảnh làm giúp mấy bài này đc ko, nhìn nó khó quá ạ
\(1,x:\left(-\dfrac{1}{3}\right)^3=\left(-\dfrac{1}{3}\right)\\ \Leftrightarrow x=\left(-\dfrac{1}{3}\right)\times\left(-\dfrac{1}{3}\right)^3\\ \Leftrightarrow x=\left(-\dfrac{1}{3}\right)^4=\dfrac{1}{81}\\ 2,\left(\dfrac{4}{5}\right)^5.x=\left(\dfrac{4}{5}\right)^7\\ \Leftrightarrow x=\left(\dfrac{4}{5}\right)^7:\left(\dfrac{4}{5}\right)^5=\left(\dfrac{4}{5}\right)^{7-5}=\left(\dfrac{4}{5}\right)^2=\dfrac{16}{25}\)
\(3,\left(x+\dfrac{1}{2}\right)^2=\dfrac{1}{16}\\ \Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=\dfrac{1}{4}\\x+\dfrac{1}{2}=-\dfrac{1}{4}\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{4}\\x=-\dfrac{3}{4}\end{matrix}\right.\)
\(4,\left(3x+1\right)^3=-27\\ \Leftrightarrow\left(3x+1\right)^3=\left(-3\right)^3\\ \Leftrightarrow3x+1=-3\\ \Leftrightarrow3x=-4\\ \Leftrightarrow x=-\dfrac{4}{3}\)
\(5,\left(\dfrac{1}{2}\right)^2.x=\left(\dfrac{1}{2}\right)^5\\ \Leftrightarrow x=\left(\dfrac{1}{2}\right)^5:\left(\dfrac{1}{2}\right)^2\\ \Leftrightarrow x=\left(\dfrac{1}{2}\right)^{5-2}=\left(\dfrac{1}{2}\right)^3=\dfrac{1}{8}\)
\(6,\left(-\dfrac{1}{3}\right)^3.x=\dfrac{1}{81}\\ \Leftrightarrow\left(-\dfrac{1}{3}\right)^3.x=\left(-\dfrac{1}{3}\right)^4\\ \Leftrightarrow x=\left(-\dfrac{1}{3}\right)^4:\left(-\dfrac{1}{3}\right)^3=-\dfrac{1}{3}\)
\(7,\left(2x-3\right)^2=16\\ \Leftrightarrow\left[{}\begin{matrix}2x-3=4\\2x-3=-4\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{7}{2}\\x=-\dfrac{1}{2}\end{matrix}\right.\)
\(8,\left(x-\dfrac{2}{3}\right)^3=\dfrac{1}{27}\\ \Leftrightarrow\left(x-\dfrac{2}{3}\right)^3=\left(\dfrac{1}{3}\right)^3\\ \Leftrightarrow x-\dfrac{2}{3}=\dfrac{1}{3}\\ \Leftrightarrow x=\dfrac{1}{3}+\dfrac{2}{3}=\dfrac{3}{3}=1\)
`@` `\text {Ans}`
`\downarrow`
(Vế 1)
`1.`
`x \div(-1/3)^3 =-1/3`
`=> x= (-1/3) \times (-1/3)^3`
`=> x= (-1/3)^4`
`2.`
`(4/5)^5 *x = (4/5)^7`
`=> x = (4/5)^7 \div (4/5)^5`
`=> x=(4/5)^2`
`3.`
`(x+1/2)^2 =1/16`
`=> (x+1/2)^2 = (+-1/4)^2`
`=>`\(\left[{}\begin{matrix}x+\dfrac{1}{2}=\dfrac{1}{4}\\x+\dfrac{1}{2}=-\dfrac{1}{4}\end{matrix}\right.\)
`=>`\(\left[{}\begin{matrix}x=\dfrac{1}{4}-\dfrac{1}{2}\\x=-\dfrac{1}{4}-\dfrac{1}{2}\end{matrix}\right.\)
`=>`\(\left[{}\begin{matrix}x=-\dfrac{1}{4}\\x=-\dfrac{3}{4}\end{matrix}\right.\)
`4.`
`(3x+1)^3 = -27`
`=> (3x+1)^3 = (-3)^3`
`=> 3x+1=-3`
`=> 3x=-3-1`
`=> 3x =-4`
`=> x=-4/3`
`5.`
`(1/2)^2*x=(1/2)^5`
`=> x=(1/2)^5 \div (1/2)^2`
`=> x=(1/2)^3`
`6.`
`(-1/3)^3*x=1/81`
`=> (-1/3)^3*x = (1/3)^4`
`=> x= (1/3)^4 \div (-1/3)^3`
`=> x=(-1/3)`
`7.`
`(2x-3)^2 = 16`
`=> (2x-3)^2 = (+-4)^2`
`=>`\(\left[{}\begin{matrix}2x-3=4\\2x-3=-4\end{matrix}\right.\)
`=>`\(\left[{}\begin{matrix}2x=7\\2x=-1\end{matrix}\right.\)
`=>`\(\left[{}\begin{matrix}x=\dfrac{7}{2}\\x=-\dfrac{1}{2}\end{matrix}\right.\)
`8.`
`(x-2/3)^3 = 1/27`
`=> (x-2/3)^3 = (1/3)^3`
`=> x-2/3=1/3`
`=> x=1/3 + 2/3`
`=> x=1`
\(2,\left(\dfrac{2}{3}x-\dfrac{1}{3}\right)^5=\dfrac{1}{243}\\ \Leftrightarrow\left(\dfrac{2}{3}x-\dfrac{1}{3}\right)^5=\left(\dfrac{1}{3}\right)^5\\ \Leftrightarrow\dfrac{2}{3}x-\dfrac{1}{3}=\dfrac{1}{3}\\ \Leftrightarrow\dfrac{2}{3}x=\dfrac{1}{3}+\dfrac{1}{3}=\dfrac{2}{3}\\ \Leftrightarrow x=\dfrac{2}{3}:\dfrac{2}{3}=1\)
\(4,\left(2x-1\right)^{10}=49^5\\ \Leftrightarrow\left(2x-1\right)^{10}=\left(7^2\right)^5\\ \Leftrightarrow\left(2x-1\right)^{10}=7^{10}\\ \Leftrightarrow2x-1=7\\ \Leftrightarrow2x=8\\ \Leftrightarrow x=4\)
\(5,x:5^2=\left(\dfrac{3}{5}\right)^2:3^2\\ \Leftrightarrow x:5^2=\dfrac{9}{25}:9\\ \Leftrightarrow x:25-\dfrac{1}{25}\\ \Leftrightarrow x=\dfrac{1}{25}\times25=1\)
\(8,\left(2x-5\right)^4=-81\)
Xem lại đề nhé số mũ chẵn thì phải ra chẵn chứ
Sửa đề \(\left(2x-5\right)^4=81\\ \Leftrightarrow\left(2x-5\right)^4=3^4\\ \Leftrightarrow2x-5=3\\ \Leftrightarrow2x=8\\ \Leftrightarrow x=4\)
Phần bên này mình chỉ làm những câu khác và khó hơn 1 tý thôi còn các câu còn lại bạn có thể tự làm được nhé
Sao dạo này Page Hoc24 có vẻ hoạt động ít quá vậy ??
e thấy hoạt động vẫn khá sôi nổi mà
có tổ chức những cuộc thi, phần hỏi đáp khá tích cực mà
#nhưng vẫn thua so với trước... :)
ai rảnh ko ib đi
buồn quá
1+1=?
BOY 2k3 NÀO RẢNH K , IB ĐI...^^
I. Nội qui tham gia "Giúp tôi giải toán"
1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;
2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.
3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.
Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.
bạn nào rảnh viết giúp mình cái này nhé: hãy kể 1 câu chuyện về 1 kỉ niệm khó quên về tình bạn của em
bạn hãy đi ra hiệu sách mua văn mẫu mà tham khảo
Chỉ ra biệt ngữ xã hội trong các đoạn hội thoại sau và nhận xét về việc sử dụng biệt ngữ của người nói:
a. - Cậu ấy là bạn con đấy à?
- Đúng rồi, bố. Nó lầy quá bố nhỉ?
b. - Nam, dạo này tớ thấy Hoàng buồn buồn, ít nói. Cậu có biết vì sao không?
- Tớ cũng hem biết vì sao cậu ơi.
Tham khảo!
a. Từ "lầy" là biệt ngữ xã hội chỉ những người hài hước và hóm hỉnh. Việc sử dụng biệt ngữ như vậy giúp cuộc hội thoại trở nên ngắn gọn, súc tích hơn. Đồng thời thể hiện được tính cách nhân vật.
b. Từ "hem" là biệt ngữ xã hội chỉ những điều không biết. Việc sử dụng biệt ngữ như vậy làm không khí nói chuyện trở nên gần gũi hơn. Thể hiện được bối cảnh câu chuyện và đặc điểm tính cách của các nhân vật tham gia vào cuộc hội thoại đó.
Các biệt ngữ:
a. lầy
b. hem
Nhận xét: Các biệt ngữ trên hình thành trên những quy ước riêng của những người trẻ tuổi, thường được sử dụng trong phạm vi hẹp. Trong câu a sử dụng khi giao tiếp với bố - người lớn nên không phù hợp. Trong câu b sử dụng khi giao tiếp với bạn bè – có thể sử dụng biệt ngữ.
Hô hấp sáng là gì? Hô hấp sáng xảy ra ở thực vật nào? Hậu quả của quá trình này?
Tham khảo
Hô hấp sáng, quang hô hấp hay hô hấp ánh sáng là một quá trình hô hấp xảy ra ở thực vật trong điều kiện có nhiều ánh sáng nhưng ít CO
2. Trong quá trình này, đường RuBP bị oxy hóa bởi enzyme rubisco - thay vì nhận phân tử cacbonic như trong chu trình Calvin của quá trình quang hợp. Hô hấp sáng được đánh giá là tác nhân làm giảm đáng kể hiệu suất quang hợp của các thực vật C3, cho dù một số nghiên cứu cho thấy quá trình hô hấp sáng có một số vai trò tích cực đối với thực vật.
Ở các thực vật C4 và thực vật CAM, chức năng oxy hóa của Rubisco bị ngăn chặn và vì vậy hô hấp sáng bị triệt tiêu, đảm bảo được hiệu suất quang hợp cao của chúng trong các điều kiện khô nóng.
tk:
Hô hấp sáng, quang hô hấp hay hô hấp ánh sáng là một quá trình hô hấp xảy ra ở thực vật trong điều kiện có nhiều ánh sáng nhưng ít CO ₂. Trong quá trình này, đường RuBP bị oxy hóa bởi enzyme rubisco - thay vì nhận phân tử cacbonic như trong chu trình Calvin của quá trình quang hợp.
- Hô hấp sáng xảy ra ở nhóm thực vật C3, tại các bào quan: lục lạp, perôxixôm và ti thể.
Bạn nào rảnh giải đề ôn tập Unit 1 này đc ko :)
I. Choose the best option to complete the following sentences.
1. You have to wait until the first _________ of clay dry before you add the next one.
A. frame B. layer C. surface D. thread
2. The museum has several life-size _______ of people and animal.
A. sculptures B. artisans C. lacquerware D. frames
3. Despite its certificate of ________, the painting was found to be a fake.
A. attraction B. tradition C. truth D. authenticity
4. How many balls of wool did you need to _____ that scarf?
A. weave B. knit C. mould D. embroider
5. Asley is _______ this painting as a gift for her elder sister’s housewarming.
A. knitting B. weaving C. embroidering D. carving
II. Choose the best option to complete the following sentences.
1. My father will pick me up _____ I return from my school trip to New York this weekend.
A. as soon as B. while C. until D. before
2. My class are going to visit the museum of ancient crafts ________ we can widen our knowledge of history.
A. although B. when C. in order that D. while
3. ______ Lucy has learnt to make pottery for a short time, she is able to make a lot of beautiful products.
A. Because B. When C. So that D. Although
4. Many people want to own handicrafts made by him ________ he is the most experienced craftman in our town.
A. as B. when C. while D. though
5. They have to heat the bronze until it melts _______ they cast the statue.
A. after B. before C. though D. although
6. This opportunity _______ at just the right time for me.
A. took over B. turned down C. turned up D. closed down
7. I have _______ the description of each product, so I decide to buy one.
A. found out B. passed down C. set up D. looked through
8. The Rocky band just _____ their third album.
A. dealt with B. lived on C. turned up D. brought out
9. They _______ the money they earn from selling handicrafts.
A. bring out B. live on C. find out D. take over
10. The lacquer workshop was ________ by a new owner.
A. taken over B. brought out C. found out D. lived on
III. Choose the best option to complete the following sentences.
1. The artisan has _______ the wood into the shape of an eagle.
A. wove B. carved C. moulded D. embroidered
2. They were anxious to _________ the original character of the village.
A. remind B. treat C. attract D. preserve
3. My grandmother has _______ a pair of wool gloves for me.
A. carved B. knitted C. moulded D. wove
4. I will show you how to ____ a metal coin.
A. embroider B. knit C. cast D. weave
5. A loom is a piece of equipment for _____ cloth.
A. knitting B. embroidering C. weaving D. carving
6. I am surfing the Internet to learn how to _______ chocolate.
A. weave B. knit C. embroider D. mould
7. James always _______ his sculptures with chemicals to preserve them.
A. treats B. moulds C. casts D. reminds
IV. Choose the best option to complete the following sentences.
1. ______ some people offered extremely high prices for this scarf, which was made by a famous artisan, my aunt decided not to resell it.
A. Because B. So that C. Though D. When
2. Sarah promised her mother to come home before 9 p.m. __________ she could go out with her friends.
A. although B. because C. when D. so that
3. ______ I want to be the best student in my class this semester, I am trying my best.
A. Since B. Although C. While D. So that
4. My friend yelled excitedly _______ I told her that she passed the exam.
A. although B. when C. before D. in order that
5. Mary gained a lot of weigh _________ she came back from her holiday.
A. so B. in order that C. after D. although
6. _______ saying anything, you should think about it carefully.
A. After B. As soon as C. While D. Before
7. Michael went on a picnic with us yesterday, _______ he was ill.
A. even though B. because C. so D. so that
8. _______ it was getting late, we decided to stop to put up a tent.
A. Although B. So that C. As D. When
9. Jacob set three different alarm clocks _______ he could get up early to prepare for his important exam.
A. because B. in order that C. so that D. Both B&C are correct
10. _______ visiting the Museum of Vietnamese History, we have more inspiration for the subject History at school.
A. After B. Because C. Although D. So that
V. Choose the best option to complete the following sentences
1. The children _______ little pots out of clay.
A. carved B. moulded C. cast D. embroidered
2. They ________ these baskets from strips of willow.
A. wove B. embroidered C. knitted D. cast
3. Nancy painted the window ______ carefully in order that no paint got onto the glass.
A. layers B. surface C. lacquerware D. frames
4. Life in London has so many ________: night clubs, good restaurants and so on.
A. authenticity B. attractions C. interests D. layers
5. David _______ his name on his pencil.
A. carved B. embroidered C. moulded D. wove
VI. Choose the best option to complete the following sentences.
1. Mr. Johnson taught sculpture for his son early ________ his son could follow his career.
A. though B. because C. so that D. when
2. You should take plenty of exercise ________ it is really good for your health.
A. so B. although C. in order that D. because
3. I found the handicrafts that my friend gave me several years ago ______ I was cleaning my room.
A. before B. while C. even though D. because
4. We decided to go for a walk around the Dong Ho village _____ we had taken a nap.
A. when B. as soon as C. after D. until
5. I am interested in abstract paintings _______ they are quite difficult to understand.
A. though B. when C. so that D. so
6. Technology changes so fast that it’s hard to _______ it.
A. live on B. look through C. run out of D. keep up with
7. We have _________ materials to make the handicrafts that you require, so could you please wait a few days?
A. faced up to B. come back C. run out of D. looked forward to
8. Liam _______ about the lacquerware exhibition on the local newspaper.
A. brought out B. found out C. turned down D. dealt with
9. He can’t accept the fact his workshop is going to be _______.
A. closed down B. come back C. looked through D. turned up
10. I hope everyone in the world __________ each other.
A. gets on with B. turns down C. lives on D. looks forward to
VII. Choose the best answer.
1. Those handicrafts may face the challenges of losing their _______.
A. authenticityB. lacquers C. craft D. sculpture
2. Local people often sell _______ like bracelets, scarves and hats to tourists.
A. handicrafts B. artisans C. lacquerware D. needles
3. They need to find a solution to ______ the local environment.
A. craft B. cast C. preserve D. weave
4. Is it true that you _______ this wollen hat yourself?
A. carved B. wove C. did D. knitted
5. The doll has been _______ out of clay.
A. embroidered B. moulded C. cast D. woven
6. I just wondered why she turned _____ his offer to help.
A. on B. down C. back D. to
7. He is going to set _______ a travel compant next year.
A. with B. down C. up D. into
8. _______ she was making a mask, he was carving a table.
A. although B. since C. because D. while
9. I’ll take my foreign friends to the local market ______ they can see how people sell and buy things.
A. so that B. so C. before D. while
10. He _______ his name on a tree and left.
A. make B. cut C. carved D. created
VIII. Complete the sentences using the given words/ phrases.
cast drumheads frame artisans workshop
craft ceramics layers team-building carvings
1. The traditional ______ village attracts millions of foreign tourists each year.
2. People use buffalo skin to make the _______.
3. His parents want him to take over their family’s _______ which was set up by his grandparents.
4. I need to buy a new _______ for the picture. Do you know any shop near here?
5. We are looking for a manager with good ______ and leadership skills.
6. It takes great skills to ________ a statue in gold.
7. To make a banh chung cake, four or five ______ or dong leaves are used as the wrapping of the dumpling, with the green blade of the outside leaf turned outward.
8. Go Cong altar cabinets are widely known for their ice shape, high-quality wood, and skillful _____.
9. It takes ______ a lot of time and effort to make a seemingly simple conical hat.
10. Recently young artisans have opted to produce artistic ______.
IX. Complete each of the following sentences using the correct form of a phrasal verbs in the box.
keep up Close down come back deal with get up look through pass down Set off turn down live on
1. My sister is an early bird. She ……………………… at 7 o’clock every day of the week.
2. We’ll ……………………… for Tay Ho village at 9 o’clock and arrive at 10 o’clock.
3. When I was a student, I………………………. small allowances from my parents
4. The government must now ………………………. The preservation of traditional craft village.
5. The banks have ……………………… a lot of branches in villages over the last few years.
6. Many foreign tourist decided to ………………………… to Viet Nam for another holiday.
7. They offered her a trip to Europe but she ………………. it ……………………
8. He has ……………………… the report and found nothing interesting.
9. Phong walk too fast and it’s really hard to …………………………… him.
10. These traditional stories have been…………………….. from parents to children over many gerneration.
X. Give the correct form of the verb in brackets.
1. Last week, my friend (invite) ...............................me to join his family on a trip to his home village.
2. If you (not, do) ............................morning exercises, you should play sports instead.
3. Congratulations, Trang. You (just, win) ...........................the first prize in the English Speaking Contest.
4. Our beach should (clean)...........................everyday to make it more beautiful.
5. Don’t forget (take)...............................your identity card with you to the interview.
6. Scientists suggested (spend).........................money on research into solar energy.
XI. Use the correct form of these words to complete each sentence.
1. It was difficult to understand the__________ dialect (LOCATE)
2. Scientists are seeking the best ways to deal with the__________ impact of pollution (ENVIRONMENT)
3. It's __________ in America to eat turkey on Thanksgiving Day. (TRADITION)
4. Peter has a lot of woolen__________to wear in winter. (SCARF)
5. I have discovered the__________ differences between the two communities. (CULTURE)
6. We need new__________ to sell in the market. (PRODUCE)
7. I can't see the__________ of sitting on a beach all day. (ATTRACT)
8. Her novels are full of __________ characters. (FORGET)
9. There is a wide __________ of patterns to choose from. (VARIOUS)
10. Try and smile. You don't want to give people the wrong__________. (IMPRESS)
11. The building is of __________ importance. (HISTORY)
12. When did your grandparents set up this__________. (WORK)
XI. Complete the second sentence so that it has a similar meaning to the first one, using the word given in brackets in the correct form.
1. Labourers in the Mekong Delta can earn enough money from their crafts during the flood seasons. (live)
_______________________________________________________________________________________
2. The methods of producing handcrafted paper flowers in Thanh Tien village in Hue were transferred from generation to generation to keep the craft alive. (pass)
_______________________________________________________________________________________
3. The tour guide gave a short speech so that foreign visitors could get information about the process of making fish sauce in Phu Quoc. (find)
_______________________________________________________________________________________
4. Craft village development is now a good way to solve the poverty in rural areas. (deal)
_______________________________________________________________________________________
5. We are thinking with pleasure about the trip in order to discover the traditional craft villages round Hue. (forward)
_______________________________________________________________________________________