2a/(2a+1)=2a(2a-1)/[(2a-1)(2a+1)]
4(2a-1)/(4a^2-4a+1)=4(2a-1)/(2a-1)²=4/(2a-1)=4(2a+1)/[(2a-1)(2a+1)]
通分2a/(2a+1),4(2a-1)/(4a^2-4a+1)
通分2a/(2a+1),4(2a-1)/(4a^2-4a+1)
数学人气：837 ℃时间：2019-11-15 07:15:44
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