数学题:用一条56米长的栅栏围一个花园

  • 时间:2020-05-02 12:13:06
  • 分类:数学世界
  • 阅读:142 次

数学题:用一条56米长的栅栏围一个花园,其中一面利用围墙,怎么围使围成的长方形面积最大?(由“鹿若”提问)

数学题解答:建议同学们自己在草稿纸上画一下示意图。

三年级还没学过小数乘法,那么在整数范围内,应该有两种方案:

一、尽可能利用靠墙的那一面。(56=10+10+36,靠墙那一面长36米)

面积:36×10=360(平方米)

二、尽可能让长和宽接近,如果是正方形就更好。(56=18+18+20,靠墙那一面长20米)

面积:20×18=360(平方米)

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