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設98%乙醇的溶質為0.98x,那麼溶液質量為x,水質量為0.02x,加水y. 0.98x/(0.02x+y)=0.75 0.98x=0.015x+0.75y 0.75y=0.965 y≈1.29 所以y:x=1.29:1 所以用x份質量的98%乙醇和1.29份質量的純水兌一塊兒
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