(y-x的-1次方)÷(x-y的-1次方)

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(y-x的-1次方)÷(x-y的-1次方)(y-x的-1次方)÷(x-y的-1次方)(y-x的-1次方)÷(x-y的-1次方)原式=(y-1/x)÷(x-1/y)=[(xy-1)/x]÷[(xy-1)

(y-x的-1次方)÷(x-y的-1次方)
(y-x的-1次方)÷(x-y的-1次方)

(y-x的-1次方)÷(x-y的-1次方)
原式=(y-1/x)÷(x-1/y)
=[(xy-1)/x]÷[(xy-1)/y]
=(1/x)÷(1/y)
=y/x
=y.x^(-1)

原式=(y-x)^(-1)/(x-y)^(-1)=1/y-x / -1/y-x=-1