A) 2X(X-1) B) 2XY (3X - 4Y) C) (X - 3)(X+3)+(X+2)(4-X) D) (2X2 + 1)(X2 - 2X - 1)

câu 1 - TIET 21 KIEM TRA 45 HAY
TIET 21 KIEM TRA 45 HAY

Câu 1 (2 điểm): Làm tính nhân:

a) 2x(x-1) b) 2xy (3x - 4y)

c) (x - 3)(x+3)+(x+2)(4-x) d) (2x

2

+ 1)(x

2

- 2x - 1).