简算题:（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/288）×128

数学题解答：把括号中每个加数，提取1/4，

得到：(1/2+1/6+1/12+1/20+……+1/72)×1/4×128

括号里面的你会算吗？1/2=1 – 1/2，1/6=1/2 – 1/3，1/12= 1/3 – /1/4，……

原式＝(1/2+1/6+1/12+1/20+……+1/72) × 1/4 × 128

＝(1 – 1/2 + 1/2 – 1/3 +1/3 – ……- 1/8 + 1/8- 1/9) × 1/4 × 128

＝8/9 × 32

＝256/9

推荐阅读：
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　 How a CDN can be your Blog’s Secret Weapon　 Why Wasted Words Kill Good Ideas And Cost Sales　 Why You Need Niche Experience to Be a Great Blogger　 The Art of the Perfect Listicle　 Tools and Resources to Help Create Your Next Content Calendar