切西瓜的数学问题
- 时间:2020-06-22 16:00:25
- 分类:数学世界
- 阅读:162 次
切西瓜的数学问题:六(1)班召开夏夜乘凉晚会,买来了许多西瓜。班主任李老师说:“今天买来了许多西瓜请大家吃。在吃以前我先要以切西瓜为名请大家做一道数学题。我规定,西瓜只能竖切,不能横剖。大家知道,切一刀最多分成2 块,切2 刀最多分成4 块,那么切3 刀最多能分成几块?切4 刀、切5 刀、切6刀呢?这中间有没有规律?如果有规律,请同学们找出来。”
李老师刚说完,同学们就七嘴八舌地讨论起来。请你也参加他们的讨论吧。
分析与解:分割圆时,切的刀数和最多可分的块数之间有如下规律:
切n刀时,最多可分成:(1+1+2+3+……+n)块。经整理,可归纳成公式:(n*n+n+2)/n 。其中表示切的刀数举例,如图所示。

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