Graphical reasoning is essential in the conduct of tests, of which one pattern is examined almost every year. Today, public and private education brings you together to examine this knowledge point in depth。
One, a painting, a little bit more
The number of drawings of a graphic, different from the normal number of straight curves, is the number of drawings of the graphic without interruption or repetition。
Methodology for determining the number of paintings
A graphic is a few paintings, determined by the number of odd points in the graphic. For a connected graphic, all nodes and endpoints in the graphic are referred to as odd points with an odd number of links. (note: endpoints must be odd) for example, the yellow dots are odd in the figure below。
A graphic with an odd point of 0 and 2 can be drawn from any point。
2 an odd point is not 0 or 2 and a graphic can be drawn from multiple drawings, with a graphic number = odd point/2. (note: all odd spots appear in pair, i. E. Even number of odd points)
So let's practice it through a few questions:
Example 1
From the four options given, select the most appropriate one to fill in the question mark to give some regularity:
Pick c. The stem graphics consist of lines with no apparent pattern in terms of the number of closed areas, lines, nodals, etc., and the third drying of the graphics has a distinct drawing feature that allows for taking into account the pattern of drawings. As can be judged by the number of odd points, the number of dry drawings is 1 and only the number of pens in item c is 1. So pick c。
Example 2
From the four options given, select the most appropriate one to fill in the question mark to give some regularity:
The answer is "d." the observation of dry graphics is clear, the overall picture is different and the endpoints are clear, giving priority to the number of drawings. All the graphics are a drawing. Option。
It is hoped that this presentation will give candidates a new understanding of the number of drawings in graphics。
