(x-y)^0除以(x-y)^-3乘以(y-x)^-21

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(x-y)^0除以(x-y)^-3乘以(y-x)^-21

(x-y)^0除以(x-y)^-3乘以(y-x)^-21
(x-y)^0除以(x-y)^-3乘以(y-x)^-2
1

(x-y)^0除以(x-y)^-3乘以(y-x)^-21
(x-y)^0/(x-y)^-3*(y-x)^-2
=1/(x-y)^-3*(x-y)^-2
=1/(x-y)^-1
=x-y