数学是一门思维严谨的学科,若在编写习题时留有疏漏,或是不规范,教者盲目教,学生盲目学,那潜移默化的影响危害就非常大了.问题1:(新苏科版《数学》七年级上册第163页练一练)1.如图1,要测量两堵围墙所形成的∠AOB的度数,但人又不能进入围墙,在墙外面可以怎样测量?解:方法一:如图2,延长AO到点C,先测量出∠BOC的度数,然后根据∠AOB与∠BOC是邻补角 Mathematics is a rigorous disciplines, if left omission in the preparation of exercises, or non-standard, blind teach the students, students blindly learn, then the impact of subtle changes is very large. Question 1: (the new Soviet version Mathematics 1, Grade VII, p. 163 Lian Yilian) 1. As shown in Figure 1, to measure the degree of ∠AOB formed by two walls, but one can not enter the wall. What can be measured outside the wall? Solution: : As shown in Figure 2, to extend the AO to point C, first measure the degree of ∠ BOC, and then 根 AOB and ∠ BOC is the adjacent fill angle