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分数(百分数)乘除法应用题中第三类问题的教学,是小学数学教学中的重点,也是一个“老大难”问题。难就难在分数乘除法的二、三类应用题的结构形式相似,实质相反,容易混淆;按旧教材分类型出结语所采用的相应的传统教法,学生难以理解和掌握。依据儿童的认识规律和数学知识的结构,统编教材
The multiplication (percentage) of the multiplication and division of teaching application of the third type of problem teaching is the primary focus of mathematical teaching, but also a “chronic” problem. Difficult to Difficulty in the fractional division method of two or three types of application structure similar in form, in essence, the opposite, easy to confuse; according to the old teaching materials used in the final conclusion of the corresponding traditional teaching methods, difficult to understand and master the students. According to children's cognitive law and the structure of mathematical knowledge, the compilation of textbooks