通分2a/(2a+1),4(2a-1)/(4a^2-4a+1)

问题描述:

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)]