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通分2mn/4m²-9与2m-3/2m+3
人气:278 ℃ 时间:2020-02-06 02:18:55
解答
4m²-9=(2m+3)(2m-3)
所以最简公分母就是4m²-9
所以(2m-3)/(2m+3)=(2m-3)²/(4m²-9)
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