化简:(1/a+1)[(1-a^2)/(1+2a+a^2)]
1个回答
(1/a+1)[(1-a²)/(1+2a+a²)]
=(1/a+1)[(1+a)(1-a)/(1+a)²]
=[(1+a)/a]*[(1-a)/(1+a)]
=(1-a)/a
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