数学,粗看,觉得它怪癖、执拗、愚顽;深交才知道它实在幽默无比、才气惊人.比如一笔画问题,什么图形可以不重复地一笔画出呢?开始可能是闹了玩的,哪知它后来神通广大.多画些一笔画你也可能会发现:1.凡仅由偶点(从这点出发的线是偶数条)组成的图形,一定是一笔画图形.从任一偶点起 In mathematics, when you look at it crudely, you feel it is quirky, stubborn, and foolish; it is only when you know it in deep communication that it is extremely humorous and amazing. For example, a stroke of a picture, what kind of graphics can be drawn without repeating it? It may be a startling game. It later became supernatural. If you draw a few more strokes, you may also find that: 1. Any figure composed only of even dots (even lines starting from this point) must be a one-stroke picture. From any even point