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初中代数中的“浓度配比问题”是列方程、解应用题的一个难点 .在教学中如何突破这一难点呢 ?采用以下三种方法 ,常可收到化难为易的效果 .一、化学法这一方法的理论依据是初中化学中求浓度 (质量分数 )的定理和性质 ,即 :溶质的质量分数 =(溶质质量 /溶液质量 ) × 10 0 % .例
The “concentration ratio problem” in junior high school algebra is a difficult problem in formulating equations and solving problems. How to overcome this difficulty in teaching? The following three methods can often be used to achieve the effect of making things difficult. I. Chemistry The theoretical basis for this method is the theorem and quality of concentration (mass fraction) in junior middle school chemistry, ie: mass fraction of solute = (mass of solute/mass of solution) × 10 0 %.