4x(2x^2-3x+1)计算

问题描述:

4x(2x^2-3x+1)计算
5ax+7by+5ay+7bx因式分解

1、=4x×2x²-4x×3x+4x
=8x³-12x²+4x
2、=5ax+5ay+7by+7bx
=5a(x+y)+7b(x+y)
=(x+y)(5a+7b)