（x-y)^3*(x-y)^2*(y-x)
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（x-y)^3*(x-y)^2*(y-x)（x-y)^3*(x-y)^2*(y-x)（x-y)^3*(x-y)^2*(y-x)=(x-y)^3*(x-y)^2*[-(x-y)]=-(x-y)^(3+2
（x-y)^3*(x-y)^2*(y-x)
（x-y)^3*(x-y)^2*(y-x)
（x-y)^3*(x-y)^2*(y-x)
=(x-y)^3*(x-y)^2*[-(x-y)]
=-(x-y)^(3+2+1)
=-(x-y)^6
（x-y)^3*(x-y)^2*(y-x)
=-(x-y)^3*(x-y)^2*(x-y)
=-(x-y)^(3+2+1)
=-(x-y)^6
-（x-y）^6
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