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行测-图形推理-5-一笔画类
2022-07-07 21:47:00 【Caspian�】
目录
一、定义
一笔画图形:一幅图能否不重复,不间断的用一笔画出来。
二、如何判断笔画数
1.数图形包含的“奇点”个数。
奇点:如果从一点出发的线条数为奇数,则该点称为“奇点”。
2.当图形总奇点数为0或2时,该图形为一笔画图形;否则为多笔画图形,且图形所需的最少笔画数=奇点数/2。
第一幅图有四个奇点(三个端点+一个交点);第二幅图有四个奇点;第三幅图有两个奇点(两个端点)。所以前两幅图最少可以用两笔画出来,第三幅图为一笔画图形。
以上两幅图交点处发出线条均为4,为偶数,故没有奇点。奇点数为0,为一笔画图形。
三、例题
1.
1,2,3奇点数为2,为一笔画图形;4,5,6奇点数为4,为两笔画图形。
2.
可知所有图像均为一笔画图形,故选C。
3.
1,2,5为一笔画图形;3,4,6为两笔画图形。
四、技巧
当图形中有一眼就看出来是一笔画图形时,考虑是否在考察一笔画;或者当题目中的图形是多个0奇点图形组成的图形(如圆、五角星)时,也可以考虑是否在考察一笔画。例如:
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