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一、教材分析本单元教材是在一年级上册教学“20以内的进位加法”的基础上,集中教学“20以内的退位减法”。“20以内的退位减法”这部分知识对于提高学生
First, the textbook analysis of the unit textbook teaching in the first grade on the basis of “20 plus carry within ” basis, based on teaching “Less than 20 abatement subtraction ”. “Less than 20 abatement subtraction ” This part of knowledge to improve students