Bài 4. Phân tích các đa thức sau thành nhân tử:

a) 36x³ y³ - 42x² y²                      

b) 3x⁴ y² + 15x² y -18xy

c) ax - bx + ab - x²

d) 3(2x -1) - 4x² + 4x -1

Bài 1. Làm tính nhân:

a) 3x² (2 - 5xy)

b) -\(\dfrac{2}{3}\) xy (xy² - x³ + 4)

c) ( x - 7 y )( xy + 1)

Bài 2. Rút gọn các biểu thức sau:

a) 5x(4x² - 2x +1) - 2x(10x² - 5x - 2)

b) 3x( x - 2) - 5x(1- x) - 8(x² - 3)

d) (x³ - 2x)(x² +1)

Complete the blanks with the Present Simple, Present Continuous, Simple Past, Past Continuous, Present Perfect, Past Perfect, Future Simple, Present Perfect Continuous of the verbs in the boxes below.

1.      I (do)_________research about Covid-19 pandemic’s effects these days.

2. Andy and Army ________a DVD. They’re playing computer games.

3.  A: (1) _______   (you/ spend) any time doing homework last weekend?

B: Yeah, I did. I (2)                                 (do) listening tests last Saturday. It was quite difficult!

4.    U22 Vietnamese Football team ______(win) three goals against U22 Indonesia at SEA GAMES 30

Complete the blanks with the Present Simple, Present Continuous, Simple Past, Past Continuous, Present Perfect, Past Perfect, Future Simple, Present Perfect Continuous of the verbs in the boxes below.

1.      I (do)                 research about Covid-19 pandemic’s effects these days.

2.      Andy and Army                        a DVD. They’re playing computer games.

3.  A: (1)                                            (you/ spend) any time doing homework last weekend?

B: Yeah, I did. I (2)                                 (do) listening tests last Saturday. It was quite difficult!

4.    U22 Vietnamese Football team                       (win) three goals against U22 Indonesia at SEA GAMES 30

When Bob graduated from university, he (be)______ in New York for 5 years.

There's so much snow on the road. ________all night? (it,snow)