一个锐角内画一条射线有3个角,画俩条有6个角,那么画n条射线有几个角?为什么?
一个锐角内画一条射线有3个角,画俩条有6个角,那么画n条射线有几个角?为什么?
数学人气:794 ℃时间:2020-05-11 22:57:55
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(n+2)*(n+1)/2
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