（x-y/x)2n×（x/y-x)2n+1 （n为正整数） 注：2n和2n+1是次幂

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原式=[(x-y)/x]^2n×[x/(y-x)]^2n+1,^2n是2n次幂,^2n+1是2n+1次幂
=[(y-x)/x]^2n×[x/(y-x)]^2n×[x/(y-x)]
=﹛[(y-x)/x]×[x/(y-x)]﹜^2n×[x/(y-x)]
=1^2n×[x/(y-x)]
=x/(y-x)