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口算与速算是小学数学教学的重要内容,要搞好这一内容的教学,必须掌握其运算原理及一些特殊的运算方法。一等差数列统编小学教材有不少涉及等差数列的知识,比如第一册39页复习题4计算下面各题:教师应明白,这个表的构造特征,横行第一个加数成等差数列递增,其公差为1,另一个加数不变。根据加法性质
Mouth calculation and speed calculation is an important part of elementary mathematics teaching. To improve the teaching of this content, we must master its operation principle and some special calculation methods. First-order difference series of primary school textbooks include a number of columns involved in arithmetic such as the first one 39 pages Review Questions 4 Calculate the following questions: Teachers should understand that the structure of this table features, The difference column is incremented with a tolerance of 1 and the other plus. According to the nature of addition