化简分式 (2+1/a-1-1/a+1)÷(a-a/1-a²)
1个回答
原式=(2a²-2+a+1-a+1)/(a+1)(a-1)÷[-(a-a³-a)/(a+1)(a-1)]
=2a²/(a+1)(a-1)×(a+1)(a-1)/a³
=2/a
=2/2
=1
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