第一节用字母表示数教材分析用字母表示数,对小学生来说,是比较抽象的。教材一方面把用字母表示数的教学内容适当分散,另一方面把用字母表示数的教学顺序作了适当的调整。先复习本单元前的有关内容中出现的用字母表示运算定律和计算 The first section with the number of letters Teaching material analysis with the number of letters, for primary school students, is more abstract. Textbooks on the one hand the number of letters using the appropriate decentralization of teaching content, on the other hand the number of letters using the teaching sequence made the appropriate adjustments. First review the contents of the unit before the emergence of the letter with the law of operations and calculations