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(1)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15％尿素溶液40公斤,要将它稀释成5％的溶液.需加多少水?解:大分子减小分子,即15-5=10,除以小分子,即10÷5=2.去乘溶液量,即40×2=80(公斤)水。(2)平方米与市亩换算法:据1平方米=0.0015亩,用口诀:“加半左移三”。举例:348平方米等于多少亩?以上述
(1) solution dilution calculation method: formulas: “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 15% urea solution 40 kg, to dilute it into a 5% solution. How much water to add? Solution: Macromolecules to reduce molecules, that is, 15-5 = 10, divided by small molecules, that is, 10 ÷ 5 = 2. Go to the solution volume, that is 40 × 2 = 80 (kg) of water. (2) Square meters and the city for the conversion method: According to 1 square meter = 0.0015 acres, with formulas: “Plus half left three.” For example: 348 square meters is equal to how Mu? In the above