⒈a-1分之a÷﹙a²-1分之a²-a﹚-﹙a-1分之1﹚
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⒈a-1分之a÷﹙a²-1分之a²-a﹚-﹙a-1分之1﹚
⒈a-1分之a÷﹙a²-1分之a²-a﹚-﹙a-1分之1﹚
⒈a-1分之a÷﹙a²-1分之a²-a﹚-﹙a-1分之1﹚
原式=a/(a-1)×(a+1)(a-1)/a(a-1)-1/(a-1)
=a/(a-1)×(a+1)/a-1/(a-1)
=(a+1)/(a-1)-1/(a-1)
=(a+1-1)/(a-1)
=a/(a-1)
原式=a/(a-1)×(a+1)(a-1)/a(a-1) -1/(a-1)
=(a+1)/(a-1)-1/(a-1)
=a/(a-1)