通分2a/(2a+1),4(2a-1)/(4a^2-4a+1)

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通分2a/(2a+1),4(2a-1)/(4a^2-4a+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)
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)]

4(2a-1)/(4a^2-4a+1)=4(2a-1)/(2a-1)^2=4/(2a-1)=4(2a+1)/(4a^2-1)
2a/(2a+1)=2a(2a-1)/(4a^2-1 )