学习几何,解题思路很重要,贯通了思路,答案甚至可以直接看出来.下面跟着江旭东同学看看他的做法.同一道题的解题思路可能有很多种,在练习《中学生数理化》杂志上的同步练习时,我就曾碰到过下面这道题.如图1,含60°角的直角三角尺的直角顶点落在直尺的一边上,若∠1=56°,则∠2的度数为多少?这是个实物图,线条偏多,我们可以根据不同的解题思路抽象出不同的图形来.思路1:从同旁内角的角度来考虑.如图2,因为两直线平行,同旁内角互 Learn geometry, problem-solving ideas is very important, through the train of thought, the answer can even be seen directly. Follow Jiang Xudong students to see his approach. The same problem-solving ideas may have many kinds, in the practice of “Journal of Mathematical Physics” On the synchronous practice, I have encountered the following problem .As shown in Figure 1, the rectangular vertex with a rectangular angle of 60 ° angle falls on one side of the ruler, if ∠1 = 56 °, then ∠2 How many degrees? This is a physical map, the line is too much, we can abstract a different graphic according to different problem solving ideas .Think 1: from the perspective of the angle with the next to consider .As in Figure 2, because the two straight lines parallel, The same side of the corner with each other