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2mn/4m²-9与2m-3/2m+3通分要过程
人气:417 ℃ 时间:2020-02-26 04:38:08
解答
4m²-9=(2m+3)(2m-3)
所以
2mn/4m²-9=2mn/(4m²-9)
2m-3/2m+3=(2m-3)²/(4m²-9)
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