2mn/4m²-9与2m-3/2m+3通分要过程
问题描述：
2mn/4m²-9与2m-3/2m+3通分要过程
答
4m²-9=(2m+3)(2m-3)
所以
2mn/4m²-9=2mn/(4m²-9)
2m-3/2m+3=(2m-3)²/(4m²-9)