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问题: 初二数学

(a^2/a-1) -a -1=

解答:

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