[(x-y)平方]n方X[(y-x)平方]立方X(y-x)立方除以X的n+2方的平方

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[(x-y)平方]n方X[(y-x)平方]立方X(y-x)立方除以X的n+2方的平方
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[(x-y)平方]n方X[(y-x)平方]立方X(y-x)立方除以X的n+2方的平方
[(x-y)平方]n方X[(y-x)平方]立方X(y-x)立方除以X的n+2方的平方

[(x-y)平方]n方X[(y-x)平方]立方X(y-x)立方除以X的n+2方的平方
[(x-y)^2]^n*[(y-x)^2]^3*(y-x)^3/[(x-y)^(n+2)]^2
=(x-y)^2n*[(x-y)^2]^3*(y-x)^3/(x-y)^(2n+4)
=(x-y)^2n*(x-y)^6*(y-x)^3/(x-y)^(2n+4)
=-(x-y)^2n*(x-y)^6*(x-y)^3/(x-y)^(2n+4)
=-(x-y)^(2n+6+3)/(x-y)^(2n+4)
=-(x-y)^(2n+9)/(x-y)^(2n+4)
=-(x-y)^(2n+9-2n-4)
=-(x-y)^5

详见附图。