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溶液稀释计算法。口诀:“大小分子差,除以小分子,去乘溶液量,便得应加水量”。举例:现有20%的食盐溶液30公斤,要将它稀释成16%的溶液,需加水多少?解:大分子减小分子,即201-6=4,除以小分子,即4÷16=0.25去乘溶液量,即30×0.25=7.5(公斤)水。平方米与亩换算法。据1平方米=0.0015亩,用口诀:“加半左移三”。举例:128平方米等于多少亩?以上述口诀先加半,即128+64=192,再把小数左移三位,即为0.192亩。
Solution dilution method. Formula: “The size of the molecule is poor, divided by small molecules, to take the solution volume, it should have added water.” For example: the existing 20% salt solution 30 kg, to dilute it into a 16% solution, how much water? Solution: macromolecules to reduce molecules, that is, 201-6 = 4, divided by small molecules, that is, 4 ÷ 16 = 0.25 to take the solution volume, that is 30 × 0.25 = 7.5 (kg) water. Mm and conversion method. According to 1 square meter = 0.0015 acres, with formulas: “Plus half left move three.” Example: 128 square meters is equal to how Mu? The above formulas plus half, that is 128 +64 = 192, then the decimal left three, which is 0.192 acres.