Can you join the nine trees with four lines?You can only cross another line.

分类: 作业答案 • 2021-12-29 10:12:43

问题描述：

Can you join the nine trees with four lines?You can only cross another line.
九棵树是按3*3的九宫格排列的
123
456
789.只要回答从哪棵到哪棵连线就行.

答

突破点是不要只看那几个点,看成平面.在九个点外在找一个点开始画即可.什么意思●－－●－－●－－| \/| \ /●●●|\ /| /\●●●| /|/| /