负3m-n分之9m05+n+3m分之n2等于多少

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负3m-n分之9m05+n+3m分之n2等于多少负3m-n分之9m05+n+3m分之n2等于多少负3m-n分之9m05+n+3m分之n2等于多少9m²/(-3m-n)+n²/(n+

负3m-n分之9m05+n+3m分之n2等于多少
负3m-n分之9m05+n+3m分之n2等于多少

负3m-n分之9m05+n+3m分之n2等于多少
9m²/(-3m-n)+n²/(n+3m)
=n²/(n+3m)-9m²/(3m+n)
=(n²-9m²)/(n+3m)
=(n-3m)(n+3m)/(n+3m)
=n-3m