八年级下册(新课标·湘教版)的第三章,主要讲授的是一类特殊的四边形———平行四边形.其中有两个例题的解题思想很值得我们去探究.先不妨来看看这两个题目:例1如图1,在△ABC中,E、F分别为AB、AC上的中点,试问EF与BC有何关系.解△ABC绕E点旋转180°,A→B,B→A,C→G,设F→H,很明 The third chapter of the eighth grade grade (New Curriculum Standards and Xiang Education Version) mainly teaches a special type of quadrilateral—parallelogram. There are two examples of problem solving ideas that are worth our exploration. Take a look at these two topics: Example 1 In Figure 1, in △ABC, E and F are the midpoints on AB and AC respectively. What is the relationship between EF and BC? The solution △ABC rotates 180° around E point, A → B, B → A, C → G, set F → H, very clear