2(x-y)(x+y)-(x-y)^2提取公因式法
问题描述:
2(x-y)(x+y)-(x-y)^2提取公因式法
答
2(x-y)(x+y)-(x-y)^2
=(x-y)(2x+2y-x+y)
=(x-y)(x+3y)