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2mn/4m^2-9与2m-3/2m+3怎么通分
人气:440 ℃ 时间:2020-03-20 19:13:50
解答
2mn/4m^2-9=2mn/[(2m+3)(2m-3)]
2m-3/2m+3=(2m-3)(2m-3)/[(2m+3)(2m-3)]=(2m-3)²/[(2m+3)(2m-3)]
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