计算【(1/a)+(1/a-1)】÷(2a-1)/(a-1)
4个回答
[(1/a)+(1/(a-1)]÷(2a-1)/(a-1)
=[(a-1+a)/a(a-1)]÷(2a-1)/(a-1)
=[(2a-1)/a(a-1)]*(a-1)/(2a-1)
=1/a
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