(a2-1分之a2+2a+1 - a-1分之1)÷a-1分之a2

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(a2-1分之a2+2a+1-a-1分之1)÷a-1分之a2(a2-1分之a2+2a+1-a-1分之1)÷a-1分之a2(a2-1分之a2+2a+1-a-1分之1)÷a-1分之a2原式=[(a+1)&

(a2-1分之a2+2a+1 - a-1分之1)÷a-1分之a2
(a2-1分之a2+2a+1 - a-1分之1)÷a-1分之a2

(a2-1分之a2+2a+1 - a-1分之1)÷a-1分之a2
原式=[(a+1)²/(a+1)(a-1)-1/(a-1)]×(a-1)/a²
=[(a+1)/(a-1)-1/(a-1)]×(a-1)/a²
=(a+1-1)/(a-1)×(a-1)/a²
=a/(a-1)×(a-1)/a²
=1/a