anh ơi, anh giải thích cho em chỗ tại sao t1<-1, t2>1 thì f(-1) và f(1) <0 với ạ. huhu em cảm ơn nh lắm ạ

m = +- 5

(x²-2x+1)/(x-1)= (x-1)²/(x-1) = x-1

i'm very sad that i wasn't accept in that group

-i'm very sad not to accept i that group.

1.The air is so dirty.I sneeze so much

If the air weren't so dirty, I wouldn't sneeze so much.

2.Because the water is polluted,we can not swim in this river

Because of the water pollution, we cannot swim in this river.

3.Smoking makes him sick

If he didn't smoke, he wouldn't be sick.

4.The students tin grade 9 are good helpers.The principal is pleased

The principal is pleased because the student in grade 9 are good helpers.

5.You smoke in public places and You'll be fined

If you smoke in public places, you will be fined.

6.Although he was sick,he did well in the exam

In spite of his sickness, he did well in the exam.

7.The Browns last painted the living room two years ago

The Browns have not painted the living room for 2 years.

8.There are so many bugs in the room because there isn't a screen on the window

If there were a screen on the window, there wouldn't so much bugs in the room.

9.He is busy right now.He can't help them

If he weren't busy right now, he could help them.

10.If she doesn't have enough money,she can't buy the house

Unless she has enough money , she cannot buy the house.

11.If he comes here tomorrow,he may be shocked

Should he come here tomorrow, he may be shocked.

12.Unless she hurries,she will miss the train

If she doesn't hurry, she will miss the train.

1.She is so selfish,so we don't like her

If she weren't so selfish, we would like her.

2.If you didn't speak quickly,I cou;d understand you

Unless you spoke quickly, I could understand you.

3.Hurry up or we will miss the bus

If we don't hurry up, we will miss the bus.

4.Do the test carefully or you may get bad mark

If you don't do the test carefully, you may get bad mark.

5.Uncles Nga hurries,she will mis the last train

If Nga doesn't hurry, she will miss the last train.

6.Mary doesn't buy this shirt because she doesn't have enouugh money

If Mary had enough money, she would buy this shirt.

7.Tom eats too much,so he gets fat

If Tom didn't eat too much, he wouldn't get fat.

8.I am not free today,so we can't go to the beach

We could go to the beach if i were free today.

9.It's rainy,so the children can't go swimming

The children could go swimming if it weren't rainy.

10.Give him some advice or he won't know what to do

If you give him some advice, he will know what to do.

11.He will get wet unless he puts the raincoat on

If he doesn't put the raincoat on, he will get wet.

12.We don't buy a lot of new books because we don't have a lot of money

We would buy a lot of new books if we had a lot of money.

We haven't come back to england for a year
=> It's a year since we came back England.

1. He will only phone if he changes his mind.

-> He won't phone if he doesn't change his mind.

2. I haven't been to Bristol for three years.

-> The last time I went to Bristol was three years ago.

3. "Please sit down", the teacher said to his students.

-> The teacher told his students to sit down .

4. He is too short to play basketball.

-> He's so short that he can't play basketball.

1.He stayed home because he got a cold.

<=>He came down with a cold, so he stayed home.