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因式分解因式分解9(x-y)²(x+y)+3(x+y)²(y-x)
人气:308 ℃ 时间:2020-01-27 16:39:36
解答
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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