Làm giúp mình bài này với
How to make school greener-cleaner
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Mình cần rất gấp,bạn nào giỏi giúp mình với!!!
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giúp mình bài này nha, làm ơn làm ơn đó, mình đang cần rất gấp rồi, nếu bạn nào làm được, mình xin quỳ gối trước bạn đó
Có bạn nào biết làm 2 bài này thì giúp mình nha mình thực sự cần rất gấp trước 9 giờ mình cảm ơn nhiều
Các bạn giúp mình làm những bài này gấp nhé ! Các bạn biết làm bài nào thì giúp mình bài nấy nhé . Mình cám ơn rất nhiều ^^
Bài 2:
Đặt \(\frac{a}{b}=\frac{c}{d}=k\Rightarrow\begin{cases}a=kb\\c=kd\end{cases}\)
=> \(\frac{5a+3b}{5a-3b}=\frac{5kb+3b}{5kb-3b}=\frac{b\left(5k+3\right)}{b\left(5k-3\right)}=\frac{5k+3}{5k-3}\left(1\right)\)
\(\frac{5c+3d}{5c-3d}=\frac{5kd+3d}{5kd-3d}=\frac{d\left(5k+3\right)}{d\left(5k-3\right)}=\frac{5k+3}{5k-3}\left(2\right)\)
Từ (1) và (2) => \(\frac{5a+3b}{5a-3b}=\frac{5c+3d}{5c-3d}\)
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Bài 3:
Đặt \(\frac{a}{b}=\frac{b}{c}=\frac{c}{d}=k\)
=> \(\frac{a}{b}.\frac{b}{c}.\frac{c}{d}=k^3\)
=> \(\frac{a}{d}=k^3\) (1)
Lại có: \(\frac{a+b+c}{b+c+d}=\frac{a}{b}=\frac{b}{c}=\frac{c}{d}=k\)
=> \(\left(\frac{a+b+c}{b+c+d}\right)^3=k^3\) (2)
Từ (1) và (2) => \(\frac{a}{d}=\left(\frac{a+b+c}{b+c+d}\right)^3\)
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Bài 1: Ta có:
\(\frac{a+b-c}{c}=\frac{a-b+c}{b}=\frac{-a+b+c}{a}\)
\(=\frac{a+b}{c}-\frac{c}{c}=\frac{a+c}{b}-\frac{b}{b}=\frac{b+c}{a}-\frac{a}{a}\)
\(=\frac{a+b}{c}-1=\frac{a+c}{b}-1=\frac{b+c}{a}-1\)
\(\Rightarrow\frac{a+b}{c}=\frac{a+c}{b}=\frac{b+c}{a}\) (1)
Xét 2 trường hợp
Nếu a + b + c = 0 \(\Rightarrow\begin{cases}a+b=-c\\a+c=-b\\b+c=-a\end{cases}\)\(\Rightarrow\frac{\left(a+b\right).\left(b+c\right).\left(a+c\right)}{abc}=\frac{-c.\left(-b\right).\left(-a\right)}{abc}=-1\)
Nếu a + b + c \(\ne0\)Áp dụng tính chất của dãy tỉ số = nhau ta có:
\(\frac{a+b}{c}=\frac{a+c}{b}=\frac{b+c}{a}=\frac{\left(a+b\right)+\left(a+c\right)+\left(b+c\right)}{c+b+a}=\frac{2.\left(a+b+c\right)}{a+b+c}=2\)
\(\Rightarrow\frac{\left(a+b\right)\left(b+c\right)\left(a+c\right)}{abc}=2^3=8\)
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Bạn nào giỏi toqns giúp mình câu này với
2 - 8^6/ 2.4^5 - 7^4. 14^8/ 49^5 . 8 . 7^7
GGiúp mình với mình đang cần rất rất gấp bạn nào giúp mình mình tick ngay
đề bài của bạn khó hiểu quá mik chỉ giải dc đến
2- 1/89 - 1/722 - 8
bạn nên ghi rõ ra cái nào ở trong phân số chứ ghi thế ai mà hiểu nổi
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giúp mình bài này nha, làm ơn làm ơn đó, mình đang cần rất gấp rồi, nếu bạn nào làm được, mình xin quỳ gối trước bạn đó
bạn nào giải nhanh bài này giúp mình với mình đang rất cần
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Bạn nào biết làm thì giúp mình 3 bài này nha mình đang cần gấp 
16 tháng 8 2021 lúc 15:45
có ai biết làm bài này k giúp mình với mình đang cần rất rất gấp mong các bạn giúp cho.I/ Change the following sentences from active into passive form. 1. Somebody has taken my briefcase.……………………………………………………………2. The teacher returned our written work to us.………………………………………………….3. She had finished her report by soon.…………………………………………………………….4. The police have arrested five suspects.………………………………………………………….5. The doctor ordered him to take a long rest.…………………………………………………………6. A group of students have...
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có ai biết làm bài này k giúp mình với mình đang cần rất rất gấp mong các bạn giúp cho.
I/ Change the following sentences from active into passive form.
1. Somebody has taken my briefcase.=>……………………………………………………………
2. The teacher returned our written work to us.=>………………………………………………….
3. She had finished her report by soon.=>…………………………………………………………….
4. The police have arrested five suspects.=>………………………………………………………….
5. The doctor ordered him to take a long rest.=>…………………………………………………………
6. A group of students have met their friends at the rail way station.
=>……………………………………………………………………..
7. They didn’t allow Tom to take these books home.
=>……………………………………………………………..
8. The teacher won’t correct exercises tomorrow.
=>……………………………………………………………….
9. Marry has operated Tom since 10 o’clock.
=>……………………………………………………………….
10. They didn’t look after the children properly.
=>……………………………………………………………..
11. Nobody swept this street last week.=>…………………………………………………
12. People speak English all over the world.
=>……………………………………………………………
13. Tom was writing two poems.=>…………………………………………………
14. She often takes her dog for a walk.=>…………………………………………………
15. They can’t make tea with cold water.=>…………………………………………………
16. The chief engineer was instructing all the workers of the plan.
=>…………………………………………………………………….
17. Somebody has taken some of my book away.
=>……………………………………………………….
18.. They will hold the meeting before the May Day.
=>………………………………………………………………
19. The boys broke the window and took away some pictures.
=>…………………………………………………………………….
20. People spend a lot of money on advertising everyday.
->……………………………………………………………………..
II. Choose the best answer
1.I come from Canada. Where .................you..................from?
a. do.............come b. did ...... come c. are ..........coming d, have .....come
2. The telephones…………..by Alexander Graham Bell
A. is invented B. is inventing C. Invented D. was invented
3. The swimming pool .............. at 9 o’clock and ............ at 18.30 everyday.
a. opens............. closes b. opens ...... closed c. opened...... closed d. opened......... closes
4. Three swimmers, Paul, Ed, and Jim, ................ now in competition for medals.
a. is b. has been c. had been d. are
5. Listen ! I .............. somebody knocking at the front door.
a. am hearing b. heard c. have heard d. hear
6.. ………………………………………..yet?
A. Have the letters been typed B. Have been the letters typed
C. Have the letters typed D. Had the letters typed
7. At 5 o’clock yesterday evening, I ……………my clothes.
a. am ironing b. have ironed c. ironed d. was ironing.
8. I ………………..along the street when I suddenly heard footsteps behind me.
a. was walking b. am walking c. walk d. walked.
9. She ………….German for two years.
a. has learnt b. is learning c. learn d. learns.
10. When I last………..Jane, she ………..to find a job.
a. see/was trying b. saw/was trying c. have seen/tried d. saw/tried.
12. French is a…………language to learn than English is.
A. difficult B. more difficult C. most difficult D. more and more difficult
13. The more polluted air we breathe,…….we get.
A. the more weaker B. the more weak
C. the weaker D. weaker more
14. The more we study, the……we are.
A. more good B. better C. better than D. good
15. The more I tried my best to help her, ……….she became.
A. less lazy B. the lazier C. the more lazy D. lazier
16. The weather becomes………………
A. colder with colder B. colder and colder
C. colder and more colder D. more and more cold
17. The more he slept,…………….irritable he became.
A. the most B. the vey more C. much more D. the more
18. ………..he worked, the more he earned.
A. The more hard B. The hard C. The harder D. The hardest
19. ………I get to know Jim, the more I like him.
A. For more B. More C. The more D. The most
20. The competition makes the price of goods……….
A. most cheap and cheap B. cheaper and cheaper
C. more cheap and more cheap D. cheaper and more cheaper
18 tháng 8 2021 lúc 7:51
có ai biết làm bài này không giúp mình với mình đang cần rất rất là gấp mong các bạn giúp cho , xin cảm ơnII. Choose the best answer1.I come from Canada. Where .................you..................from?a. do.............come b. did ...... come c. are ..........coming d, have .....come2. The telephones…………..by Alexander Graham BellA. is invented B. is inventing C. Invented D. was invented3. The swimming pool .............. at 9 o’clock...
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có ai biết làm bài này không giúp mình với mình đang cần rất rất là gấp mong các bạn giúp cho , xin cảm ơn
II. Choose the best answer
1.I come from Canada. Where .................you..................from?
a. do.............come b. did ...... come c. are ..........coming d, have .....come
2. The telephones…………..by Alexander Graham Bell
A. is invented B. is inventing C. Invented D. was invented
3. The swimming pool .............. at 9 o’clock and ............ at 18.30 everyday.
a. opens............. closes b. opens ...... closed c. opened...... closed d. opened......... closes
4. Three swimmers, Paul, Ed, and Jim, ................ now in competition for medals.
a. is b. has been c. had been d. are
5. Listen ! I .............. somebody knocking at the front door.
a. am hearing b. heard c. have heard d. hear
6.. ………………………………………..yet?
A. Have the letters been typed B. Have been the letters typed
C. Have the letters typed D. Had the letters typed
7. At 5 o’clock yesterday evening, I ……………my clothes.
a. am ironing b. have ironed c. ironed d. was ironing.
8. I ………………..along the street when I suddenly heard footsteps behind me.
a. was walking b. am walking c. walk d. walked.
9. She ………….German for two years.
a. has learnt b. is learning c. learn d. learns.
10. When I last………..Jane, she ………..to find a job.
a. see/was trying b. saw/was trying c. have seen/tried d. saw/tried.
12. French is a…………language to learn than English is.
A. difficult B. more difficult C. most difficult D. more and more difficult
13. The more polluted air we breathe,…….we get.
A. the more weaker B. the more weak
C. the weaker D. weaker more
14. The more we study, the……we are.
A. more good B. better C. better than D. good
15. The more I tried my best to help her, ……….she became.
A. less lazy B. the lazier C. the more lazy D. lazier
16. The weather becomes………………
A. colder with colder B. colder and colder
C. colder and more colder D. more and more cold
17. The more he slept,…………….irritable he became.
A. the most B. the vey more C. much more D. the more
18. ………..he worked, the more he earned.
A. The more hard B. The hard C. The harder D. The hardest
19. ………I get to know Jim, the more I like him.
A. For more B. More C. The more D. The most
20. The competition makes the price of goods……….
A. most cheap and cheap B. cheaper and cheaper
C. more cheap and more cheap D. cheaper and more cheaper
III. Rewrite:
1) Although Tom was a poor student, he studied very well.
=> In spite of ………………………………………………………
2) Mary could not go to school because she was sick.
Because of ………………………………………………………………..
3) Although the weather was bad, she went to school on time.
=> Despite ……………………………………………………………..
4) My mother told me to go to school although my stomachache was sick.
=> In spite of ………………………………………………………………..
5) Because there was a big storm, I stayed at home.
=> Because of ……………………………………………………..
6) Tom was admitted to the university although his grades were bad.
Despite …………………………………………………………………………
7) Although she has a physical handicap, she has become a successful woman.
=> Despite ……………………………………………………………………….
8) In spite of his good salary, Tom gave up his job.
=> Although………………………………………………………..
II.
1. a
2. d
3. a
4. d
5. d
6. a
7. d
8. a
9. a
10. b
12. b
13. c
14. b
15. b
16. b
17. d
18. c
19. c
20. b
III.
1. In spite of being a poor student, Tom studied very well.
2. Because of her sickness, Mary could not go to school.
3. Despite the bad weather, she went to school on time.
4. In spite of my sick stomachache, my mother told me to go to school.
5. Because of the big storm, I stayed at home.
6. Despite his bad grades, Tom was admitted to the university.
7. Despite her physical handicap, she has become a successful woman.
8. Although his salary was good, Tom gave up his job.
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