（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
（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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