在平面几何教学中,我们经常会遇到这样一些命题,在同一叙述下,却能画出多种不同的图形,它们有个共同的特点,那就是其中一部分图形是固定的,而另外一部分是可变的,一旦我们忽略其中某些动图的位置,极有可能造成漏解.怎样才能把适合题意的图形一个不漏的全画出来呢?首先我们要认真分清命题的类型与特点,然后再进行周密 In plane geometry teaching, we often encounter such propositions, under the same narrative, but can draw a variety of different graphics, they have a common characteristic, that is, one part of the graphics is fixed, and the other part is Variable, once we ignore the location of some of the animation, it is very likely to cause leakage.How can we put a suitable omission of the full picture of the problem? First of all, we must carefully distinguish the type and characteristics of the proposition, And then carefully