问题标题:
因式分解因式分解9(x-y)²(x+y)+3(x+y)²(y-x)
问题描述:
因式分解因式分解9(x-y)²(x+y)+3(x+y)²(y-x)
刘红兵回答:
9(x-y)²(x+y)+3(x+y)²(y-x)
=9(x+y)(x-y)(x+y)-3(x+y)²(x-y)
=9(x+y)²(x-y)-3(x+y)²(x-y)
=6(x+y)²(x-y)
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