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负3m-n分之9m05+n+3m分之n2等于多少
人气:368 ℃ 时间:2020-06-19 18:12:47
解答
9m²/(-3m-n)+n²/(n+3m)
=n²/(n+3m)-9m²/(3m+n)
=(n²-9m²)/(n+3m)
=(n-3m)(n+3m)/(n+3m)
=n-3m
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