(a方+3)/(a方-1)-(a+1)/(a-1)+1

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(a方+3)/(a方-1)-(a+1)/(a-1)+1(a方+3)/(a方-1)-(a+1)/(a-1)+1(a方+3)/(a方-1)-(a+1)/(a-1)+1(a²+3)/(a²

(a方+3)/(a方-1)-(a+1)/(a-1)+1
(a方+3)/(a方-1)-(a+1)/(a-1)+1

(a方+3)/(a方-1)-(a+1)/(a-1)+1
(a²+3)/(a²-1)-(a+1)/(a-1)+1
=(a²+3)/[(a+1)(a-1)]-(a+1)²/[(a+1)(a-1)]+(a²-1)/[(a+1)(a-1)]
=[(a²+3)-(a²+2a+1)+(a²-1)]/[(a+1)(a-1)]
=(a²+3-a²-2a-1+a²-1)/[(a+1)(a-1)]
=(a²-2a+1)/[(a+1)(a-1)]
=(a-1)²/[(a+1)(a-1)]
=(a-1)/(a+1)