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5a(x-y)^2+10a(y-x)^3
人气:281 ℃ 时间:2020-04-24 06:54:24
解答
5a(x-y)^2+10a(y-x)^3
=5a(x-y)^2[1+2(y-x)]
=5a(x-y)^2(2y-2x+1)
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