浓度为30%的酒精溶液15千克,与浓度为40%的酒精浓液35千克混合后,得到的酒精溶液的浓度是多少?
人气：466 ℃ 时间：2020-01-28 12:38:13
解答
I浓度=15*30%+35*40%/(15+35)=37%
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