一道数学题,谁快我选谁
问题描述:
一道数学题,谁快我选谁
(5x-5)(2x+3)-2(3x-5)(4x-1)
答
(5x-5)(2x+3)-2(3x-5)(4x-1)
=(5x-5)(2x+3)+(-6x+10)(4x-1)
=10x^ 2+15x-10x-15-24x^ 2+6x+40x-10
=-14x^ 2+51x-25
我快