A. 4X(X – 3) – 3X(2 +X)A. (1 + 2X) + 2(1 + 2X)(X - 1) + (X - 1)2B. (X...

1. - DE KIEM TRA CHUONG 1
DE KIEM TRA CHUONG 1

1. Thu gọn:

a. 4x(x – 3) – 3x(2 +x)

a. (1 + 2x) + 2(1 + 2x)(x - 1) + (x - 1)

2

b. (x - 3)(x + 3) - (x - 3)

2

b.

2x 5x 2

(

+ +

) (

2x 3 3x 1

−

) (

−

)

c. (x - 1)

2

(x + 2) - (x - 2)(x

2

+ 2x + 4)

c. (x – 1)

2

– (x + 2)(x - 2)