Làm tính nhân

Bài 1: Làm tính nhân:

a) 2x. (x2 – 7x -3)                                            b) ( -2x3 + <!--[if gte mso 9]><xml> </xml><![endif]-->y2 -7xy). 4xy2

c)(x – 2)(x2 + 3x – 4)                                       d) (2x2 - <!--[if gte mso 9]><xml> </xml><![endif]-->xy+ y2).(-3x3)

e)(x2 -2x+3). (x-4)                                           f) ( 2x3 -3x -1). (5x+2)

g) ( 25x2 + 10xy + 4y2).  ( 5x – 2y)                  h) (2x – 1)(3x + 2)(3 – x)