关于分式的题

问题描述:

关于分式的题
(x-1)[1-(x+1)/(x-1/x)]

(X-1)[1-(X+1)/(X-1/X)]= (X-1)[ 1- (X+1) (X/(X²-1)]= (X-1)[1-(X²+X)/(X²-1)]= (X-1){(X²-1-X²-X)/(X²-1)= (X-1){(-X-1)/[(X+1)(X-1)]}= (-(X+1) {(X-1))/[(X+1)(X-1...