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:67 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:
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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