1.       (1/2 x – 4y)²

2.       (x/2 + 2y²) (x/2 - 2y²)

3.       (x + 1/3)

1)       ( x – 4y)²

2)      (  + 2y²) (  - 2y²)

3)      (x² – 4) (x² + 4)

4)      ( x+y)² + ( x –y ) ²

5)      ( 2x +3) ² – (x +1)

6)      ( x + )²

a)     x³ - 4³

1)     x³ + 4³

2)     4³  - x³

3)     5³ + x³

4)     ( y + 7)³

5)     ( y -7)³

6)     ( 5 – y)³

7)     ( 5 + y)³

8)     ( 3 +y)³

9)     ( 3 - y)³

1.       ( x + 5)²

2.       (7   + 2x)²

3.       ( x – 6) ²

4.       ( x – 4y)²

5.       ( 3x – 2y)²

6.       (4x + 2y)²

7.       (x + 3y) (x – 3y)²

8.       (x)² – (3y)²

9.       ( y + 2 x)²

10.   ( 3x – y )²

Bài tập viết lại câu

1.      He gets  to work in one hour

=>  It take

2.      Studying English is very necessary

=>  It’s our duty

Bài tập viết lại câu

1.      Studying English is very necessary

=> It is

Bài tập viết lại câu

1.      We live too far away from our school

=> We don't live

22. I think “Tom and Jerry is the best ______________

A. film                                    B. sport                                  C. newsreel                D. cartoon

23. In the future, we won’t go on holiday to the beach but we ________go on holiday to the moon.

A. must                                   B. can’t                                  C. might                     D. won’t

24. _____________the air is cleaner, people will have less breathing problems.

A. Unless                               B. When                                 C. If                             D. Because

25. They couldn’t go on a picnic ______________the weather was bad.

A. because                             B. when                                  C. but                          D. or

26. My house is ______________to the supermarket.

A. to the left                          B. behind                              C. near                        D. next

27. At the weekend, we can play a __________ of badminton or join in a football match.

 A. sport                                 B. game                                  C. match

28. Football is an _____________ game.

A. outdoor                            B. indoor         C. individual        

29. Kien is not very__________ . He never plays games. 

   A. sport                              B. sporting                         C. sporty

30. Thanh likes __________ weather because he can go swimming.

   A. hot                                                 B. cold                          C. rainy

31. Vietnamese students play different sports and games _____________ the break time.

         A. in                          B. on                                C. during

32. As it doesn’t snow in Viet Nam, we cannot __________ skiing.

            A. play                  B. go                                 C. do

33. Many girls and women ________ aerobics to keep fit. 

          A. play                    B. go                                  C. do

34. It’s very __________ to swim there. The water is polluted

   A. safe                               B. unsafe                         C. unpopular

( x – 3 )³ – (x – 3) . ( 3 + 6 . x + 1)

a)      ( x -4 ) ( x+ 4 ) – (x² + 1 ) ( x² -1)

b)      ( x + 1 )² ( x – 1) ² – 3 ( x + 1 ) – ( x – 1)

c)      5 ( x + 2 ) ( x – 2) – ½ ( 6 – 8x  + 17