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51问答网 > 王大伯用28米长的竹篱笆靠墙围一块长方形的菜地，这块菜地的面积是多少平方米？长是十厘米

王大伯用28米长的竹篱笆靠墙围一块长方形的菜地，这块菜地的面积是多少平方米？长是十厘米

2025-04-08 06:03:12

推荐回答（4个）

回答1：

（28-10）÷2=18÷2=9（米）
10x9=90（平方米）
答面积 90平方米

回答2：

首先用长方形周长公式算出宽。因靠墙所以有一长，两宽。故宽等于28试零点零贰除以贰等于13点504米。故面积为长乘宽即13.504×0.1等于1.3504平方米。

回答3：

解，宽=(28-10)÷2=7(米)
S=7x10=70(平方米)

回答4：

13.9*0.1=1.39个平方

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