(x-y分之1)除以(y-x分之1)

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(x-y分之1)除以(y-x分之1)

(x-y分之1)除以(y-x分之1)
(x-y分之1)除以(y-x分之1)

(x-y分之1)除以(y-x分之1)
(x-1/y)/(y-1/x)
(xy/y-1/y)/(xy/x-1/x)
=(xy-1)/y÷[(xy-1)/x]
=(xy-1)/y*[x/[(xy-1)]
=x/y

(x-y分之1)除以(y-x分之1)
=-(x-y分之1)除以(x-y分之1)
=-1