.Phân tích các đa thức sau thành nhân tử:

 a) 5x²y- 10xy²  

  b) x²  + 2xy + y² - 5x - 5y      

  c) x² – 6x + 8                               

  d)5x² – 10xy + 5y² – 20z²

Bài 1. Làm tính nhân:

          a) 3x(5x² - 2x - 1);                       

          b) (x² - 2xy + 3)(-xy);

          c) x²y(2x³ - xy² - 1);                  

           d) x(1,4x - 3,5y);

          e) xy(x² - xy + y²);           

           f)(1 + 2x - x²)5x;

          g) (x²y - xy + xy² + y³). 3xy²; 

            h) x²y(15x - 0,9y + 6);

1. He can't go out because he has to study for his exam.

-> If he didn't have to study for his exam, he could go out

2. She is lazy so she can't pass the exam.

-> If she were not lazy, she could pass the exam

3. He will pay me tonight; I will have enough money to buy a car.

-> If he pays me tonight, I will have enough money to buy a car

4. He smokes too much; that's why he can't get rid of his cough.
-> If he didn't smoke too much, he could get rid of his cough

5. She is very shy, so she doesn't enjoy the party.

-> If she were not shy, she would enjoy the party

6. I will get a work permit. I will stay for another month.

-> If I get a work permit, I will stay for another month

7. He doesn't take any exercises. He is so unhealthy.

-> If he took exercises, he wouldn't be so unhealthy

8. We can't get the ticket because I don't have the right change.

-> If I had the right change, we could get the ticket

9. Study hard or you won't pass the exam.

-> If you study hard, you will pass the exam

10. Don't be impatient or you will make mistakes.

-> If you are impatient, you will make mistakes

❤

1,i am sick today ,so i don't go to class

--> if I weren't sick today, I would go to class.

2,there isn't a river in my village.we can't go swimming

-->if there were a river in my village, we could go swimming.

3,i don't have enough money.i can't go swimming everyday

-->if I had enough money , I could go swimming everyday.

4,work harder or you won't pass the exam

-->if you work harder, you will pass the exam.

5,tom has so many accidents because he is so clumsy

-->if Tom weren't so clumsy, he wouldn't have so many accidents.

6,listen to the teacher please or you can't understand the lesson

-->if you don't listen to the teacher, you can't understand the lesson.

7,i think you should surf the internet for more in for mation

-->if I were you, I would surf internet for more information.

8,it is raining, so we can't finish the game

-->if it weren't raining, we could finish the game.

9,hurry up or you miss the bus

-->if you don't hurry up, you will miss the bus.

10,he doesn't get high marks because he is lazy

-->if he weren't lazy, he would get high marks.

11,the office may be closed,so mark won't be able to get in

-->if the office might not be closed, Mark could get in.

12,i don't know to control this machine

-->i wish I knew how to control this machine.

13,it started raining an hour ago

-->it has been raining for an hour

14,she last visited herparents last sunday

-->she has visited her parents since last Sunday.

15,i study engish badly

-->i wish I studied English better.

❔

He can't go out bacause he has to study for his exam.

=> If he didn't have to study for his exam,he could go out.

2. She is lazy so she can't pass the exam.

=> If  she weren't lazy, she could pass the exam

3. H will pay me tonight; I will have enough money to buy a car.

=> If he doesn't pay me tonight, I won't have enough money to buy a car

4. He smokes too much; that's why he can't get rid of his cough.

=> If he didn't smoke too much, he could get rid of his cough

5. She is very shy, so she doesn't enjoy the party.

=> If she weren't shy, she would enjoy the party

6. I will get a work permit. I will stay for another month.

=> If I don't get a work permit,I won't stay for another month

7. He doesn't take any exercises. He is so unhealthy.

=> If he took any exercises,he wouldn't be so unhealthy.

8. We can't get the ticket because I don't have the right change.

=> If I had the right change,we could get the ticket

9. Study hard or you won't pass the exam.

=> If you don't study hard, you won't pass the exam

10. Don't be impatient or you will make mistakes

=>If you are impatient , you will make mistakes

1. He can't go out because he has to study for his exam.

-> If he didn't have to study for his exam, he could go out

2. She is lazy so she can't pass the exam.

-> If she were not lazy, she could pass the exam

3. He will pay me tonight; I will have enough money to buy a car.

-> If he pays me tonight, I will have enough money to buy a car

4. He smokes too much; that's why he can't get rid of his cough.

-> If he didn't smoke too much, he could get rid of his cough

5. She is very shy, so she doesn't enjoy the party.

-> If she were not shy, she would enjoy the party

6. I will get a work permit. I will stay for another month.

-> If I get a work permit, I will stay for another month

7. He doesn't take any exercises. He is so unhealthy.

-> If he took exercises, he wouldn't be so unhealthy

8. We can't get the ticket because I don't have the right change.

-> If I had the right change, we could get the ticket

9. Study hard or you won't pass the exam.

-> If you study hard, you will pass the exam

10. Don't be impatient or you will make mistakes.

-> If you are impatient, you will make mistakes

1.I'm trying to..get rid of.my cold..

2.I hope you soon.get better..

3.I..get home late.after working all night.

4.She.got the sack...because her work was unsatisfactory.

5.We ought to go home,It's.getting dark..

6.He didn't laugh because he didn't.get the joke..

7.I need plenty of time to..get ready.before I go out.

8.I.got a headache...after the party.

9.I was so excited that I couldn't.get to sleep..

10.If you can't do it yourself,you'll have to.get someone else to do it..for you

1.Please..get around.your work,I didn't mean interrupt you.

2.She doesn't.get on with..her younger breother,they're always quarrelling.

3.I hope I'll be able to.get round to..answering the letter this evening.

4.They managed to..get out of.doing the work by preventing to be busy.

5.I tried to.get ..the point.across..to him but he didn't seem to see what I was...

6.The dull weather is do depressing-It's.getting ..me..down.

7.However difficult a problem is,there's usually a way to.get at..it.

8.You don't need two hot meals a day.I'm sure you can..get by.on one.

9....get off.the bus when you get to the railway station.

10.How are you.getting on..with this exercise?

11.I've tried ringing her several times but I haven't been able to.get through...

12.They decided to.,get together..later in the week for an informal meeting.