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3.绘图与数学——一笔画成的图形。小朋友画图形时,很想一笔画完,并且在画的过程中也不想重复。怎样的图形才能一笔画成呢?数学家研究后得出一笔画的规律是:一笔画的图形必须是连通图。连通图就是指一个图形各部分总是有边相连的。(1)凡是由偶点(若从一点发出的线条条数为偶数,这个点就是偶点)组成的连通图,一定可以一笔画成。画时可以把任一偶点为起点,最
3. Drawing and math - one stroke into a graphic. When children draw graphics, they really want to finish one stroke and do not want to repeat them during the painting. What kind of graphics can be a stroke into it? Mathematicians come to the conclusion of the law of a stroke is: a stroke of the graphics must be connected diagram. Connectivity diagram refers to the part of a graphic is always connected. (1) A connected graph composed of even points (if the number of lines emitted from one point is even, this point is even) must be drawn in one stroke. Painting can be any even point as a starting point, most