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2mn/4m²-9与 2m-3/2m+3通分
人气:229 ℃ 时间:2020-03-29 14:58:38
解答
1.2mn/4m²-9
2.2m-3/2m+3= (2m-3)²/(2m+3)(2m-3)=(2m-3)²/4m²-9
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