分解因式5（x+y）²+23（x²-y²）-10（x-y）²
问题描述：
分解因式5（x+y）²+23（x²-y²）-10（x-y）²
答
5(x+y)²+23(x²-y²)-10(x-y)²
=5(x+y)²+23(x+y)(x-y)-10(x-y)²
=[5(x+y)-2(x-y)][(x+y)+5(x-y)]
=(3x+7y)(6x-4y)