数学题：一块长方形铁皮，从四个脚各切掉一个边长为5厘米的正方形，然后做成盒子。（长方形的长为30厘米，宽为25厘米）这个盒子用了多少铁皮？它的容积有多大？（如下图）

数学题解答：

1.用的铁皮面积：30×25-5×5×4=650(平方厘米)

2.盒子的容积：（30-5-5）×（25-5-5）×5=1500（立方厘米）

推荐阅读：
5 Tips for Staying Safe Online　 10 Signs Your Blog is Working　 The Key to Risk-Free Cloud-Based IT Equipment Shipping　 Bring Your Multi-Site Development Work To The Next Level With A 　 
How to Create Killer SEO Content on a Budget　 Learn to Achieve Your Goals with 5 Secrets of Great Bloggers　 What is Cornerstone Content And Why It’s Important　 How to Attract Female Readership For Your Blog　 Double your traffic with White Hat SEO techniques　 Blogging As Therapy: True Life Stories Of Victims And How They C