教学目的１．进一步提高学生计算有关７的加减法的正确率和速度。２．使学生知道图上加括号和问号的用意，能从图里看清告诉了什么，要求什么，并能列式计算。３．初步渗透应用题的基本结构：即已知部分求整体或已知整体和其中的一部分求另一部分。进一步加深对加、减法含... Teaching purpose 1. Further improve students' accuracy and speed of calculation of 7 additions and subtractions. 2. So that students know the purpose of adding brackets and question marks on the map can see what is told from the map, what is required, and can be calculated. 3. The basic structure of the initial application of infiltration: the known part of the whole or the known whole and part of it seeking another part. Further deepen the addition, subtraction ...