2mn/4m²-9与 2m-3/2m+3最简公分母是什么?怎样通分?

问题描述:

2mn/4m²-9与 2m-3/2m+3最简公分母是什么?怎样通分?

“liljw0924”:二个数的分母分别为4m²-9和2m+34m²-9=(2m)²-3²=(2m+3)×(2m-3)它们的公分母是(2m+3)×(2m-3)通分后写成:2mn/(2m+3)×(2m-3)=2mn/(4m²-9)和(2m-3)×(2m...