数学题:把一根5米长的长方体沿横截面截成3段
- 时间:2020-06-07 17:40:52
- 分类:数学世界
- 阅读:139 次
数学题:把一根5米长的长方体沿横截面截成3段,表面积比原来的增加了36平方分米。长方体原来的体积是多少立方米?(由“刘悦龙”同学提问)
数学题解答:长方体没横截面,截成了3段,在每一个切开的地方会增加两个横截面,一共增加了4个横截面:2×2=4(个)
表面积比原来增加了36平方分数,就是这4个横截面的总面积,所以每个横截面的面积是:
36÷4=9(平方分米)
最后要求长方体的体积,只需拿“横截面的面积×长”就可以了。
因为有一个长方体体积公式就是“长方体的体积=横截面面积×长”:
9×5=45(平方分米)
推荐阅读:The Basics of Building an SEO-Friendly Site with Wix Social Media Image Sizes Cheat Sheet for 2016 The Blogging Evolution: From Hobby To Marketing Tool We Want Plates! Food Blogger Criticizes Quirky Food Serving Tren Company Blog Tips: How To Keep Your Company Blog Out Of A Rut 10 Tips to Humanize Your Company Blog 10 Communication Skills Every Blogger Should Hone Social Media Cheatsheet of Keyboard Shortcuts 2016 Edition Tanzania Plagued By Censorship, Offers Journalists A Course On D Young Cancer Patient Has Decided To Live-Blog His Health’s Decli
- 评论列表
-
- 添加评论