数学题:用一根20米长的铁丝,围成一个长、宽是整米数的长方形
- 时间:2020-04-29 11:52:54
- 分类:数学世界
- 阅读:136 次
数学题:用一根20米长的铁丝,围成一个长、宽是整米数的长方形,这个长方形的面积最大是多少平方米?
数学题解答:
20米即是这个长方形的周长,除以2即得到“长+宽”
20÷2=10(米)
也就是说,长方形的长+宽要等于10,10的组成有以下几种:
5+5
6+4
7+3
8+2
9+1
其中面积最大的是5×5=25(平方米)[此时长和宽相等,是正方形,但广义上说“正方形是特殊的长方形”]
其次面积是6×4=24(平方米),如果从狭义上理解,必须是普通的长方形,不包括正方形的话,就选24平方米这个答案。
资优网老师更倾向于第一种答案。
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