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【教学现象】苏教版数学第十一册第1页例1:大雁塔高64米,比小雁塔高度的2倍少22米。小雁塔有多少米?在解决这个问题时,学生出现了以下几种情况:第一种情况:(64+22)÷2第二种情况:(64-22)÷2第三种情况:设小雁塔有x米,2x-22=64。对于以上三种不同的解决问题方法,让学生进行方法的比较,能发现第二种情况是不对的。但是,最终大家一致认为第一种方法是最简单的。觉得用方程方
Teaching phenomenon】 【Sujiao version of mathematics eleventh book Page 1 Example 1: Big Wild Goose Pagoda is 64 meters high, less than 2 times the height of the Small Wild Goose Pagoda 22 meters less. Little Goose Pagoda how many meters? In solving this problem, the students appeared the following situations: The first case: (64 +22) ÷ 2 The second case: (64-22) ÷ 2 The third case: Small Wild Goose Pagoda has x meters, 2x-22 = 64. For the above three different ways to solve the problem, let students compare the methods, you can find the second case is wrong. However, in the end everyone agreed that the first method was the simplest. Think square equation