2mn/4m²-9与 2m-3/2m+3通分
问题描述:
2mn/4m²-9与 2m-3/2m+3通分
答
1.2mn/4m²-9
2.2m-3/2m+3= (2m-3)²/(2m+3)(2m-3)=(2m-3)²/4m²-9