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一条直线上有若干个点,以任意两点为端点可以确定一条线段,线段的条数与点的个数之间的对应关系如下表所
一条直线上有若干个点,以任意两点为端点可以确定一条线段,线段的条数与点的个数之间的对应关系如下表所
2025-03-16 23:31:31
推荐回答(1个)
回答1:
设线段有n个点,分成的线段有m条.有以下规律:
n个m条
2 1
3 1+2
4 1+2+3
…
n m=1+…+(n-1)
=
n(n?1)
2
7个点把线段AB共分成
7(7?1)
2
=21条.
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