A) (3X + 4X2− 2)( −X2 +1 + 2X) B) (2X Y− ) (4X2+2XY Y+ 2)

bài 3: - 20BAI DS 20BAIHH 10DE THI HK1
20BAI DS 20BAIHH 10DE THI HK1

Bài 3: Tớnh:

a) (3x + 4x

2

−

2)(

−

x

2

+1 + 2x)

b) (

2x y−

) (

4x

2

+2xy y+

2

)