题目内容
分解因式:3(x+y)(x-y)-(x-y)2.
原式=(x-y)[3(x+y)-(x-y)](2分),
=(x-y)(3x+3y-x+y)(3分),
=(x-y)(2x+4y)(4分),
=2(x-y)(x+2y)(5分).
=(x-y)(3x+3y-x+y)(3分),
=(x-y)(2x+4y)(4分),
=2(x-y)(x+2y)(5分).
练习册系列答案
相关题目