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2014年第5期《中小学数学(小学版)》刊登了徐佳乐的《从“大豆榨油”说起》一文。文中介绍了自己通过“以退为进”的方法和运用“列表”的策略,帮助学生理解“大豆榨油”问题的经验。但“大豆榨油”问题为什么会成为“难题”?破解这类难题最有效、最根本的办法是什么?说得似乎不太明了。本文想继续这一问题的探讨。一、“大豆榨油”问题为什么会成为“难题”?“用4千克的大豆可以榨油1.6千克。照这样计算,1千克的大豆可以榨油多少千克?要榨1千克油需要多少千克大豆?”是徐文中列举的例子(注:本题数
No. 5, 2014 “Primary and secondary mathematics (primary school edition)” published Xu Jiale’s “From” soybean oil “Speaking of” article. The article introduced his own “to retreat into ” method and the use of “list ” strategy to help students understand “soybean oil ” problem experience. However, “soybean oil” problem why it becomes “difficult problem ”? What is the most effective and fundamental solution to such problems? It does not seem clear. This article wants to continue the discussion of this issue. One, “soybean oil” problem why become a “problem”? “With 4 kg of soybeans can be extracted 1.6 kg. According to this calculation, 1 kg of soybeans can squeeze how many kilograms? To squeeze 1 kg How many kilos of oil need soybean? ”Is an example cited by Xu (Note: This question number