(x+y)^2-(x+y)^3 .(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3
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(x+y)^2-(x+y)^3.(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3(x+y)^2-(x+y)^3.(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3(x+y)^2-
(x+y)^2-(x+y)^3 .(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3
(x+y)^2-(x+y)^3 .
(x+y)^2-(x+y)^3
(x-y)^2-(x-y)^3
(x+y)^2-(x+y)^3 .(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3
(x+y)^2-(x+y)^3
=(1-x-y)(x+y)^2
(x-y)^2-(x-y)^3
==(1-x+y)(x-y)^2
你要求啥？
(x+y)^2-(x+y)^3
=(1-x-y)(x+y)^2
(x-y)^2-(x-y)^3
=(1-x+y)(x-y)^2
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