所谓平面几何中的“动中求静”问题,是指问题中的几何图形发生了运动,需要在此前提下证明某个结论.求解这类问题的关键是要弄清图形在运动变化过程中,哪些“元素”的位置和数量发生了变化,哪些没有发生变化,并在其运动变化中找出不变的规律.下面以各地一些中考试题为例,对其解 The so-called “quiet for motion” problem in plane geometry means that the geometry in the problem has moved and it is necessary to prove a certain conclusion under this premise. The key to solving this kind of problem is to figure out the figure in the process of movement. Which of the “elements” have changed their position and number, which have not changed, and find out the invariable laws in their movements. Here are some examples of middle-test questions in various places.