(x-y)².(x-y)³.(y-x)².(y-x)³ 怎么算,
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(x-y)².(x-y)³.(y-x)².(y-x)³怎么算,(x-y)².(x-y)³.(y-x)².(y-x)³怎么
(x-y)².(x-y)³.(y-x)².(y-x)³ 怎么算,
(x-y)².(x-y)³.(y-x)².(y-x)³ 怎么算,
(x-y)².(x-y)³.(y-x)².(y-x)³ 怎么算,
(x-y)².(x-y)³.(y-x)².(y-x)³
=-(x-y)².(x-y)³.(x-y)².(x-y)³
=-2(x-y)^(2+3+2+3)
=-2(x-y)^10