Bạn nào giúp mình bài 11, 12, 15 được không ? Mình đang cần gấp lắm
Bài 8 :
Tích B = 2 . 4 . 6 . 8 . 20
Có chia hết cho 30 không ?
Các bạn giúp mình với mình đang cần gấp lắm ! Bạn nào giải được thì phản hồi lại cho mình trước 12 h 20 " với ạ !
\(B=2\cdot4\cdot6\cdot8\cdot20=\left(6\cdot20\right)\cdot2\cdot4\cdot8=120\cdot2\cdot4\cdot8\)
mà 120 chia hết cho 30 (120 : 30 = 4)
=> B chia hết cho 30
Vậy B có chia hết cho 30
É ô ét ai giúp mình bài này với ạ, sẵn tiện giải thích cho mình với được ko ạ hiện giờ mình đang cần gấp lắm ạ mai mình thi rồi nên mong cao nhân nào giải bài với giải thích bài này cho mình với ạ
\(\dfrac{9^{15}.8^{11}}{3^{29}.16^8}\) \(\dfrac{2^{11}.9^3}{3^5.16^2}\)
\(\dfrac{9^{15}.8^{11}}{3^{29}.16^8}=\dfrac{\left(3^2\right)^{15}.\left(2^3\right)^{11}}{3^{29}.\left(2^4\right)^8}=\dfrac{3^{30}.2^{33}}{3^{29}.2^{32}}\)
Ta lấy vễ trên chia vế dưới
\(=3.2=6\)
\(\dfrac{2^{11}.9^3}{3^5.16^2}=\dfrac{2^{11}.\left(3^2\right)^3}{3^5.\left(2^4\right)^2}=\dfrac{2^{11}.3^6}{3^5.2^8}\)
Ta lấy vế trên chia vế dưới
\(=2^3.3=24\)
\(\dfrac{9^{15}.8^{11}}{3^{29}.16^8}=\dfrac{\left(3^2\right)^{15}.\left(2^3\right)^{11}}{3^{29}.\left(2^4\right)^8}=\dfrac{3^{30}.2^{33}}{3^{29}.3^{32}}=3.2=6\)
\(\dfrac{2^{11}.9^3}{3^5.16^2}=\dfrac{2^{11}.\left(3^2\right)^3}{3^5.\left(2^4\right)^2}=\dfrac{2^{11}.3^6}{3^5.2^8}=2^3.3=8.3=24\)
\(\dfrac{9^{15}.8^{11}}{3^{29}.16^8}=\dfrac{3^{30}.2^{33}}{3^{29}.2^{32}}=3.2=6\)
\(\dfrac{2^{11}.9^3}{3^5.16^2}=\dfrac{2^{11}.3^6}{3^5.2^8}=2^3.3=8.3=24\)
Giúp mình bài này được không ạ? Mình đang cần gấp lắm😥😧
D C D B C C C D A
Sam puts up the decorations.
Five guests came to the party.
Molly and Sam play video games with their cousins
The family was celebrating too early. Dad's birthday was two months away.
relationship
celebration
married
golden
quietly
celebratory
refer
1. he dislike being called " the liar " => He dislike people..CALLING HIM THE LIAR.
2. The police are following the suspects => The suspects ..ARE BEING FOLLOWED BY THE POLICE.
3. She always expects to be admired by everybody => She always expects everybody..TO ADMIRE HER...
4. Someone stole his car two days ago => He had ..HIS CAR STOLEN BY SOMEONE TWO DAYS AGO..
Có bạn nào biết làm câu này thì giúp mình nha mình đang cần cực gấp 11 giờ mình phải nộp cho thầy rồi(chỉ cònn 2 tiếng gấp lắm rồi) nếu được thì mình cảm ơn rất rất nhiều
4: Xét ΔAMC có
I là trung điểm của AM
N là trung điểm của AC
Do đó: IN là đường trung bình của ΔAMC
Suy ra: IN//MC
hay IN//BC
Có bạn nào biết làm câu này thì giúp mình nha mình đang cần cực gấp 11 giờ mình phải nộp cho thầy rồi(chỉ cònn 2 tiếng gấp lắm rồi) nếu được thì mình cảm ơn rất rất nhiều
1: Xét ΔABC có AB=AC
nên ΔABC cân tại A
Suy ra: \(\widehat{B}=\widehat{C}\)
Ta có: ΔBAC cân tại A
mà AH là đường trung tuyến ứng với cạnh đáy BC
nên AH là đường cao ứng với cạnh BC
Có bạn nào biết làm câu này thì giúp mình nha mình đang cần cực gấp 11 giờ mình phải nộp cho thầy rồi(chỉ cònn 2 tiếng gấp lắm rồi) nếu được thì mình cảm ơn rất rất nhiều
1. Tam giác AOC và tam giác BOD có: AO = BO; CO = DO: góc AOC = góc BOD (đối đỉnh)
--> tam giác AOC = tam giác BOD (c.g.c)
--> góc ACO = góc ODB
Mà 2 góc này ở vị trí so le trong
--> AC // BD
b) Tam giác ACD và tam giác BDC có: CD chung; AC = BD (do tam giác AOC = tam giác BOD); góc ACO = góc ODB (câu a)
--> tam giác ACD = tam giác BDC
c) tam giác ACD = tam giác BDC (câu b)
--> góc DBC = góc CAD
Tam giác DAE và tam giác CBF có: góc DBC=góc CAD; AE = BF; BC = AD
--> tam giác DAE = tam giác CBF (c.g.c)
1/2+1/3+1/6+1/12+1/15+1/20+1/30+1/35+1/42+1/63
mình đang cần gấp lắm đó
nhanh lên các bạn ơi
nhanh'nhanh
sắp đi học thêm rồi
không làm được bài này cô giáo mình cắt cổ mình
nỗi là tại các bạn ko giúp mình đó
1/2+1/3+1/6+1/12+1/15+1/20+1/30+1/35+1/42+1/63
=(1/2+1/6+1/12+1/20+1/30+1/42) + (1/3 +1/15+1/35+1/63)
=(1/1.2+1/2.3+1/3.4+1/4.5+1/5.6+1/6,7)+(1/1.3+1/3.5+1/5.7+1/7.9)
=(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6 -1/7) + 1/2.(2/1.3+2/3.5+2/5.7+2/7,9)
=(1-1/7)+ 1/2.(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9)
=6/7+1/2 .(1-1/9)
=6/7+1/2.(8/9)
=6/7+4/9
=82/63
học tốt
sr bạn mình làm hơi chậm nhé
Các bạn giúp mình với bạn nào trả lời đc thì mình cho điểm nhé mình đang cần gấp lắm.
72 ÷ (x - 15) = 8
72 : ( x - 15 ) = 8
x - 15 = 72 : 8
x - 15 = 9
x = 9 + 15
x = 24
Vậy x = 24 .
Học tốt !
x - 15 = 72 : 8
x - 15 = 9
x = 9 + 15
x = 24
Có bạn nào biết mấy bài này không ? Giúp mình vs. Mình đang cần gấp lắm.
UNIT 10: HEALTH AND HYGIENE
I. Choose one word with underlined part pronounced differently from the others
1. A. wanted B. needed C. looked D. visited
2. A. bus B. busy C. unhappy D. cut
3. A. looked B. walked C. learned D.stopped
4. A. party B. apartment C. far D. practice
5. A. stay B. late C. back D. date
6. A. laughed B. looked C. collected D. missed
7. A. asked B. missed C. called D. cooked
8. A. changed B. measured C. brushed D. talked
II. Choose the best answer to complete each sentence.
1.We’ll meet……………..the movies theater.
A. in front of B. next to C. on D. opposite
2.Did you …….. to school yesterday.
A. go B. went C. going D. goes.
3. It’s not far…………..here, so I often walk.
A. to B. with C. from D. over
4.………………….to meet you Hoa.
A. Please B. Pleased
C. I’m please D. None is correct
5.Hoa is sad, because she knows …………………here.
A. someone B. anyone C. no one D. everyone
6.Her new school is……………than her old one.
A. bigger B. large C. beautiful D. more
7.My brother is ………………grade 7.
A. at B. in C. on D. of
8.Everyday he………….the bus to work.
A. gives B. comes C. catches D. goes
9.Lan is staying…………..her aunt’s house in Hanoi now.
A. in B. on C. with D. at
10.It often ……………me 15 minutes to go to school by bike.
A. takes B. gets C. gives D. has
11. They suggested that he…………. by bike or public transport.
A. should travel B. might travel C. travels D. traveledp
12. The light…………… so we couldn’t see any thing in the dark.
A. went B. went off C. went by D. went out
13. You should get a ………..to check if there is any crack in the pipe.
A. electrician B.plumber C. carpenter D. goldsmith
14.Is it true……………. the law says there is no smoking in restaurant in this city?
A.that what B. what C. if D. that
15. Lan is a…………………typist. She often makes many spelling mistakes.
A. careful B. care C. careless D.carelessly
16. Where …………. you last Sunday ?
a. is b. was c. are d. were
17. Last week, Mr. Tan…………….to Ho Chi Minh City for a trip.
a. go b. went c. going d. goes
18. What is your …………, Lan? – I’m 45 kilos.
a. weight b. height c. age d. name
19. ……………is this book? – It’s 4,000 dong.
a. How much b. How old c. How many d. How tall
20. Yesterday, I …………….to school because I was sick.
a. goes b. go c. went d. didn’t go
21. Hoa ………………her teeth three times every day.
a. brushes b. brushing c. brush d. brushed
22. Did you buy any souvenirs in Nha Trang ? + Yes, I ……………
a. do b. am c. does d. did
23. I live ……………Quang Tri town with my grandmother.
a. on b. at c. between d. in
24. ……………..did Lan go to the dentist’s last week? – Because she had a bad toothache.
a. What b. Why c.When d. Where
25. Would you………….…me to the post office, please?
a. take b. took c. taking d. Take
III. Read the passage and answer the following questions.
Mr Hai has two job. On Monday, Tuesday and Wednesday he works in a hospital where he helps to look after children who are ill. He goes to the hospital by bus. He starts job at ten o’clock and works until quarter to five. He stay at home on Thursday and Friday, he writes stories. Last night one of his roommates cooked the meal. After dinner, they looked at the newspapers to see what’s on TV and they talked about the day.
1/ How many jobs does Mr Hai have ?
………………………………………......................................................................
2/ Where does he work ?
………………………………………………...........................................................
3/ What time does he start job ?
………………………………………………...........................................................
4/ Does he write stories ?
………………………………………………...........................................................
5/ What did he and his roomate do last night?
……………………………………………………………………………....................
IV. Write the past form of the verbs.
1. stop …………… 2. forget ……………
3. wash …………….... 4. send ……………
V. Rewrite the sentences using the printed phrases so that they have the same meaning
1. What is Lan’s weight?
=> How …………………………………………….…………….………..?
2. How old are you?
=> What is …………………………………..…………………………?
3. How tall is he?
=> What………………………………………………………………...……?
bn tách ra đi, chứ nhìn qua thấy nản lắm/:
II. Choose the best answer to complete each sentence.
1.We’ll meet……………..the movies theater.
A. in front of B. next to C. on D. opposite
2.Did you …….. to school yesterday.
A. go B. went C. going D. goes.
3. It’s not far…………..here, so I often walk.
A. to B. with C. from D. over
4.………………….to meet you Hoa.
A. Please B. Pleased
C. I’m please D. None is correct
5.Hoa is sad, because she knows …………………here.
A. someone B. anyone C. no one D. everyone
6.Her new school is……………than her old one.
A. bigger B. large C. beautiful D. more
7.My brother is ………………grade 7.
A. at B. in C. on D. of
8.Everyday he………….the bus to work.
A. gives B. comes C. catches D. goes
9.Lan is staying…………..her aunt’s house in Hanoi now.
A. in B. on C. with D. at
10.It often ……………me 15 minutes to go to school by bike.
A. takes B. gets C. gives D. has
11. They suggested that he…………. by bike or public transport.
A. should travel B. might travel C. travels D. traveledp
12. The light…………… so we couldn’t see any thing in the dark.
A. went B. went off C. went by D. went out
13. You should get a ………..to check if there is any crack in the pipe.
A. electrician B.plumber C. carpenter D. goldsmith
14.Is it true……………. the law says there is no smoking in restaurant in this city?
A.that what B. what C. if D. that
15. Lan is a…………………typist. She often makes many spelling mistakes.
A. careful B. care C. careless D.carelessly
16. Where …………. you last Sunday ?
a. is b. was c. are d. were
17. Last week, Mr. Tan…………….to Ho Chi Minh City for a trip.
a. go b. went c. going d. goes
18. What is your …………, Lan? – I’m 45 kilos.
a. weight b. height c. age d. name
19. ……………is this book? – It’s 4,000 dong.
a. How much b. How old c. How many d. How tall
20. Yesterday, I …………….to school because I was sick.
a. goes b. go c. went d. didn’t go
21. Hoa ………………her teeth three times every day.
a. brushes b. brushing c. brush d. brushed
22. Did you buy any souvenirs in Nha Trang ? + Yes, I ……………
a. do b. am c. does d. did
23. I live ……………Quang Tri town with my grandmother.
a. on b. at c. between d. in
24. ……………..did Lan go to the dentist’s last week? – Because she had a bad toothache.
a. What b. Why c.When d. Where
25. Would you………….…me to the post office, please?
a. take b. took c. taking d. Tak