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对于“3 1/4加上1.75的和除以5/6乘以7/8的积,结果是多少?”这道文字题,学生往往把算式错误地列成(3 1/4+1.75)÷5/6×7/8。造成错误的原因,主要是他们只按文字叙述顺序列式,而对文字题中哪些是主要成份,哪些是附加成份,分辨不清。为了较好地解决这一问题,在教学实践中我摸索出一种辅助性的分析方法——缩句分节分析法。它分三步进行:1.最后一步求什么?2缩句分节;3.列式。 例如,125乘以320与240的差,积是多少? 第一步,抓住“积是多少”这一问句,从而确定了最后一步是求两个因数之积。到底是哪个数乘以哪个数,这就要求我们正确分节缩句。
For the “3 1/4 plus 1.75 divided by 5/6 multiplied by 7/8, what is the result?” In this essay, students tend to mistake formulas (3 1/4 + 1.75) ÷ 5/6 × 7/8. The main reason for the mistakes is that they only describe the sequence of the texts, but which of the textual questions are the main components and which are the additional components are indistinguishable. In order to solve this problem better, I find out a kind of auxiliary analysis method in the teaching practice - reduction sentence cut-off analysis. It is divided into three steps: 1. What is the last step seeking? 2 reduction clause; 3. Column. For example, what is the product of 125 multiplied by the difference between 320 and 240? In the first step, take the question “What is the product?” And thus determine that the last step is to find the product of the two factors. Which number is multiplied by the number in the end, which requires us to correct the sub-contractions.