(x-y)^2-(x-y)^3怎么做给个过程
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(x-y)^2-(x-y)^3怎么做给个过程
(x-y)^2-(x-y)^3怎么做给个过程
(x-y)^2-(x-y)^3怎么做给个过程
(x-y)^2-(x-y)^3=(x-y)^2(1-(x-y))=(x-y)^2(1-x+y)
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