(x-y)^3·(y-x)^4 / [(x-y)^8/(y-x)^3]
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(x-y)^3·(y-x)^4 / [(x-y)^8/(y-x)^3]
(x-y)^3·(y-x)^4 / [(x-y)^8/(y-x)^3]
(x-y)^3·(y-x)^4 / [(x-y)^8/(y-x)^3]
原式=(x-y)^3(y-x)^4(y-x)^3/(x-y)^8
=-(x-y)^7(x-y)^3/(x-y)^8
=-(x-y)^10/(x-y)^8
=-(x-y)^2
收起
(x-y)^3·(y-x)^4 / [(x-y)^8/(y-x)^3]
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