数学题:一个长方形铁皮,长为32厘米

  • 时间:2020-05-02 12:13:06
  • 分类:数学世界
  • 阅读:121 次

数学题:一个长方形铁皮,长为32厘米,在它四个顶点分别剪去边长为4厘米的正方形,然后折起来焊成一个无盖的长方形铁皮盒。已知它的容积是480立方厘米,原来这块铁皮的面积是多少?

数学题解答

长方形铁皮

无盖铁皮盒子的长:32-4-4=24(厘米)

无盖铁皮盒子的高:4厘米

无盖铁皮盒子的宽:不知道,需要计算。但是我们知道它的容积是480立方厘米。

所以先算出无盖铁皮盒子的宽:480÷24÷4=5(厘米)

铁皮原来的宽:5+4+4=13(厘米)

铁皮的面积:32×13=416(平方厘米)

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