原式=(1-a-1)/(1-a)×(1-a²)/a²
=-a/(1-a)×(1+a)(1-a)/a²
=-(1+a)/a
計(jì)算(1-1-a分之1)(a^2分之1-1)
計(jì)算(1-1-a分之1)(a^2分之1-1)
數(shù)學(xué)人氣：989 ℃時(shí)間：2020-02-05 09:54:03
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