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fen jie yin shix^2(x-y)+(y-x)
人气:153 ℃ 时间:2020-04-25 08:46:56
解答
x^2(x-y)+(y-x)
=x²(x-y)-(x-y)
=(x-y)(x²-1)
=(x-y)(x+1)(x-1)
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