通分:2mn/4m²-9与2m-3/2m+3
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通分:2mn/4m²-9与2m-3/2m+3
通分:2mn/4m²-9与2m-3/2m+3
通分:2mn/4m²-9与2m-3/2m+3
2mn/4m²-9
=2mn/(2m-3)(2m+3)
2m-3/2m+3
=(2m-3)²/(2m-3)(2m+3)
2mn÷(4m²-9)=2mn/[(2m+3)(2m-3)],
(2m-3)(2m+3)=(2m-3)^2*(2m+3)^2/[(2m+3)(2m-3)].