7,5*x+x*3,5=39,93

(7,5+3,5)*x=39,93

11x=39,93

x=39,93/11

x=3,63. Vậy x=3,63

1.  Don’t leave those boys alone or they will tear down the place.

don't leave those boys alone or the place will be teared down.

2. No one has ever known him to be dishonest.

he hasn't been ever known to be dishonest.

3. People consume gas faster than they produce it.

gas is consumed faster than they produce it.

4. No one has seen him anywhere this week.

he hasn't been seen anywhere this week.

5. They saw him walking with his friends before he got lost.

he was seen walking with his friends before he got lost.

6. Someone saw him pick up a stone and throw it at the riot police.

he was seen pick up a stone and throw it at the riot police.

7. They gave him a last chance before expelling him from the school.

he was given a last chance before expelling him from the school.

8. He likes people to call him “sir”.

he is liked to be call ''sir''

9. My mother used to make us clean the house.

we was used to making clean the house by my mother.

10. They rumoured that the man was still living.

the man was rumoured to be still living.

11.They think that the prisoner escaped by climbing over the wall.

the prison is thought to be escaped by climbing over the wall.

12.People say that three men were arrested after the explosion.

three men were said to be arrested after the explosion.

1. Our group is planning to help the community .......for............encouraging all members to participate ............in.........a recycling programme.

2. Nam had high marks .........in............exams ..........by.........working very hard .............at....... school.

3. We hope to get some money .........from.............our school Y&Y.

4. My father isvery good .........at..............gardening.

5. It is verykind ..........of........you to help me.........with..........this math exercise.

6. Tom isn’t here .........at............the moment.

7. I like getting ........up.............early .........in.........the morning.

8. Apart ..........of...........school activities, we also take part ........in..........other programs such as raising funds..........up............the poor, helping street children.

9. The students are looking forward..........to..........their summer holidays.

10. The old lady can’t write so she asked Ba to fill .......in.....the form ...to...........her.

1. John took the book home yesterday.

the book was taken home yesterday by john.

2. Did they mail the parcel two days ago?

was  the parcel mail two days ago?

3. They didn’t clean the room carefully last Sunday.

the room wasn't cleaned carefully last sunday.

4. They have to pay the bill before the fifth of the month.

the bill had to pay before the fifth of the month.

5. The police are holding the suspected man for further questioning.

 the suspected man is being hold for further questioning by the police

6. Some body has locked the door and I can’t open it.

the door has been locked and i can't open it.

7. Did the clown make you laugh a lot last night?

was you made laugh a lot by the clown last night?

8. I want you to do this work now.

you were wanted to be done this work now.

9. Who gave you this letter?

who was this letter given?

10. What are you going to do this weekend?

what was you going to do this weekend?

11. What made her cry?

what was her cry made?

12. People said that he took my bicycle.

he was said to be taken my bicycle.

13. Write your name on this form.

your name is written on this form.

máy mk cũng vậy

1.william shakespeare is the world famous's english playwright.

2.he was born in 1564.

3..no, he wasn't

4.he married when he was eighteen.

5.he had three children

6.he wrote about 37 plays

7.he wrote about thirty seven play of all kinds:comedies, tragedics,and histories.

9..when he died, he was 52 years old

10.he was buried  in the church of stratford

1. Don’t let others see you.

you aren't saw by let others

2. The workers were digging a large hole in the ground.

 a large hole was digged in the ground by the workers.

3. Before they took exams they had revised their lessons.

before exams were taken their lesson has been revised.

4. The car knocked a woman down in the street.

a woman was knocked down in the street by the car.

5. When he came home, his father was reading a newspaper.

When he came home, a newspaper was read by his father.

6. Cows were eating grass on the meadow.

grass was eaten on the meadow by cows.

7. Mycousin will meet you at the station.

you will be met at the station by my cousin.

8. She is running her own company.

her own company is being ran 

9. Visitors must leave umbrellas and raincoats in the cloakroom.

umbrellas and raincoats must be left in the cloakroom by visitors.

10. My mother used to make us clean the house.

we were used to making clean the house by my mother.

1.“I’ll pay back the money,” he said.    (promise)

he promised he would pay back the money.
2.I’ll phone the police,” she said to us. (threaten)

she threaten us to phone the police
3.“Hurry up” he said to me.

he told me to hurry up.
4.“Can I do the washing up?” said Lan. (offer)

lan offered she could do the washing up.
5.“You should stop smoking,” the doctor told me. (advise)

the doctor advised me to stop smoking.
6.“Could you change the light bulb for me?” she said.

she said that i could change the light bulb for her.
7.“Don’t be stupid,” said my father.

my father said not to be stupid.
8.“Would you like to come to my party?” Lan said to me. (invite)

lan invited me to come to her party.
9.“Don’t leave the door unlocked,” my mother told me.

my mother asked me not to leave the door unlocked.
10.“Can you speak English?” said the foreigner.

the foreigner said that i could speak english.
11.“Where did you buy this book, Nam?” said his friend.

his friend asked nam where he bought that book.
12.“We are going to visit Lan this afternoon,” said Nga

nga said that they were going to visit lan that afternoon.
13.“I must stay at home to look after my little sister,” Mai told us.

mai told us that she had to stay at home to look after her little sister.
14.“Did you watch the film on TV last night?” my classmate said.

my classmate asked if i watched the film on tv last night.
15.“ How long have you learnt English, Nga?” said Mrs Hang.

mrs hang asked nga how long she had learnt english.

1. It was an interesting film. We saw it many times. (such...that/ so...that)

It was such an interesting film that We saw it many times.

2. She gave Tom easy exercises. He could do them in only 15 minutes. (such...that)

She gave Tom so easy exercises that He could do them in only 15 minutes.

3. These boxes were very heavy. They had to ask for our help. (so...that/ such...that)

These boxes were so heavy that They had to ask for our help.

4.He has much work to  do. He can’t go to the cinema with us. (so ...that/ such...that)

He has so much work to  do that He can’t go to the cinema with us.