试题与答案

一根绳子弯曲成如图(1)所示的形状,当用剪刀像图(2)那样沿虚线a把绳子剪断时,绳子

题型:填空题

题目:

一根绳子弯曲成如图(1)所示的形状,当用剪刀像图(2)那样沿虚线a把绳子剪断时,绳子被剪成5段;当用剪刀像图(3)那样沿虚线b(b∥a)把绳子再剪一次时,绳子就被剪为9段;若用剪刀在虚线a,b之间把绳子再剪(n-2)次(剪刀的方向与a平行),这样一共剪n次时,绳子的段数为()。

答案:

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