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计算:y(x-y)^2+(y-x)^3=?
人气:309 ℃ 时间:2020-06-05 04:09:23
解答
y(x-y)^2+(y-x)^3
= y(y-x)^2+(y-x)^3
= (y-x)^2[y+(y-x)]
= (y-x)^2(2y-x)
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