化简:(a²-1)÷(1减去a分之一)=?
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化简:(a²-1)÷(1减去a分之一)=?
化简:(a²-1)÷(1减去a分之一)=?
化简:(a²-1)÷(1减去a分之一)=?
(a²-1)÷(1-1/a) (分子分母同乘以a)
=a(a²-1)÷(a-1)
=a(a+1)
=a²+a
(a²-1)÷(1减去a分之一)
=(a+1)(a-1)÷[(a-1)/a]
=(a+1)a
=a²+a
a(a+1)