(2x-1)(x-3)-2(3x-2)(x-3)

问题描述:

(2x-1)(x-3)-2(3x-2)(x-3)

(2x-1)(x-3)-2(3x-2)(x-3)
=(2x2-6x-x+3)-2(3x2-9x-2x+6)
=2x2-7x+3-6x2+22x-12
=-4x2+15x-9.