2mn/4m²-9与 2m-3/2m+3最简公分母是什么?怎样通分?

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2mn/4m²-9与 2m-3/2m+3最简公分母是什么?怎样通分?
2mn/4m²-9与 2m-3/2m+3最简公分母是什么?怎样通分?

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+3
4m²-9=(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-3)/(2m+3)×(2m-3)=(2m-3)²/(4m²-9)
祝好,再见.

二个数的分母分别为4m²-9和2m+3
4m²-9=(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)
(2m-3)×(2m-3)/(2m+3)×(2m-3)=(2m-3)²/(4m²-9)