(a+b)(x+y)-(b+a)(y-x)因式分解

问题描述:

(a+b)(x+y)-(b+a)(y-x)因式分解

(a+b)(x+y)-(b+a)(y-x)
=(a+b)(x+y)+(a+b)(x-y)
=(a+b)[(x+y)+(x-y)]
=(a+b)(x+y+x-y)
=2x(a+b)