five friends met and they shook hands with each other.how many hand shakes took place?

分类: 作业答案 • 2022-01-09 18:05:27

问题描述：

five friends met and they shook hands with each other.how many hand shakes took place?
please write chinese.

答

5个朋友见面,他们相互握手.问：他们一共握了几次手?（每个人和别人共握手4次,共有五个人,所以是握手20次）