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:138 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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