I, Give the correct form of verbs in the brackets

1, At 8 a.m tomorrow , he ( chat)will be chatting with his friends in America .

2, Listen! Our teacher (try)is trying to explain very important knowledge .

3, Thanks for your invitation to your party tomorrow , but I (work)will work all day tomorrow .

4, It (take)took people a lot of time to send a letter to those who live far away ten years ago .

5, In the next 15 years, peple (communicate)will be communicating with each other by glasses.

6, Which TV programme (you/watch)will you be watching at 1 p.m tomorrow ?

7, When she comes to class late today, the teacher will be writing(write) a lot of things on the board.

8, In the years 2030 , they (control)will be controling their phone call by their mind.

9, When I (be)was small , we were keeping(keep) in touch with our relatives by writing letters.

10, She (always/make)will always make silly mistakes in spellings when she writes emails .

15 gioi, 10 kha,5 trung binh

Hãy viết lại các câu sau:

1. We didn't spend our summer holiday in Da Lat last year.

2. My brother often has a three-week summer vacation.

3. Does Nam has fewer stamps than Viet?

=>Does Viet have more stamps than Nam?

4. Chi usually spends two hours doing her homework every evening.

=>Chi usually takes two hours to do her homework every evening.

5. What did you buy at the souvenir store yesterday?

Chuyển sang câu bị động

1. He shouldn't do that sillu thing

=>that sillu thing shouldn't be done by him

2. My sister gave me a new pair of jeans on my fifteen birthday

=>I was given a new pair of jeans by My sister on my fifteen birthday

3. The workers are building a super market on your street

=>a super market is being built on your street by The workers

4. The zoo keepers feed the animals twice aday

=> the animals are fed by The zoo keepers twice a day

5. They have sold their car to pay their debt

=>their car has been sold to pay their debt

6. We are going to grows flowers in the front gardent

=>flowers are going to be grown in the front gardent by us

7. You mustn't use this machine after 5.30 pm

=>this machine mustn't be used by You after 5.30 pm

8. My grandmother's knitting a new sweater for me

=> a new sweater is being knitted for me by My grandmother

9. Passengers shouls't throw their tickets

=>their tickets shouls't be thrown by Passengers

10. Candidates may not use dictionakies

=>dictionakies may not be used by Candidates

11. A machine could do this much more easily

=>this much more easily could be done by A machine

12. They ought to look him up

=>He ought to be looked up

13. People ought to introduce him to the village

=>He ought to be introduced to the village

14. You can see him off the airport

=>He can be seen off the airport

15. No one could do anything to put the fire off

=> anything could be done to put the fire off

16. He is going to present the athletes to the spectators

=>the athletes are going to be presented to the spectators by him

17. We wont't keep those books for reference

=> those books won't be kept for reference by us

18. President were signing those papers at 8 o' clock yesterday

=>those papers were being signed by President at 8 o' clock yesterday

19. Waiters and waitreses were seeving customers

=>customers were being served by Waiters and waitreses

20. Was Mary helping her mother at the time ?

=>Was Mary's mother being helped by her at the time ?

21. Alex was preparing that report when I came to see him

=>that report was being prepared by Alex when he was come to see by me

22. A police took him to the police station

=>He was taken to the police station by a police

23. Her husband didn't love her

=>She wasn't loved by Her husband

hướng tây chứ hướng nào

=9⁵

tick cho mình nha

"Look, don't worry, I'll help you if you like."

Sue said she.............would help you..........................(three words)

Chuyển sang câu bị động.

1. He turned off the lights when he went out

=>the lights were turned off when he went out

2. They made the instrument long ago

=>the instrument was made long ago

3. Someone will translate this letter into vietnamese

=>this letter will be translated into vietnamese

4. Our grandmother tells childrent's stories to us

=> childrent's stories are told to us by Our grandmother

5. You haven't answered my question yet

=> my question hasn't been answered by You yet

6. He drivers me to my office

=>I am driven to my office by Him

7. Have they paid you the money

=>Have you been paid the money?

8. The teacher explains the leeson

=>the leeson is explained by The teacher

9. Mrs Green is cooking the food in the kitchen

=> the food is being cooked in the kitchen by Mrs Green

10. These boys made that noise

=>that noise was made by These boys

11. People speak English all over the word

=>English is spoken all over the word

12. I can't do these exercises quickly

-> these exercises can't be done quickly by me

13. The movie has disappointed us very much

=>we have been disappointed very much by The movie

14. THe police are holding him for futher questioning

=>He is being held for futher questioning by THe police

15. Some body has looked the box and I can't open it

the box has been looked and it can't be opened by me

Gọi số có 2 chữ số là \(\overline{ab}\)

ĐK : 9≥a≥1 , 9≥b≥0 , a,b ∈ N.

Theo đề ta có :

(a+b)³=(10a+b)²

<=>a+b=[1+9a/(a+b)]²

=>a+b là số chính phương và 9a ⋮ (a+b)

=>a+b ∈ {1;4;9;16} và 9a ⋮ (a+b)

+)a+b=1 => 10a+b=1 (loại)

+)a+b=4 => 10a+b=8 (loại)

+)a+b=9 => 10a+b=27 =>a=2 và b=7 (nhận)

+)a+b=16=>10a+b=64 =>a=6 và b=4 (loại)

Vậy số cần tìm là 27.

Vì x+y+z=0;xy+yz+xz=0

⇒(x+y+z)²=x²+y²+z²+2(xy+yz+xz)=0

⇒(x+y+z)²=x²+y²+z²=0

⇒x=y=z=0

⇒S=(x−1)²⁰⁰⁵+(y−1)²⁰⁰⁶+(z+1)²⁰⁰⁷=(−1)²⁰⁰⁵+(−1)²⁰⁰⁶+1²⁰⁰⁷=1