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x(x+y)(x-y)-x(x+y)的平方怎么提公因式
人气:422 ℃ 时间:2020-04-06 21:12:06
解答
x(x+y)(x-y)-x(x+y)²
=x(x+y)[(x-y)-(x+y)]
=x(x+y)(x-y-x-y)
=-2xy(x+y)
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