有一排电线杆，每相邻两根间的距离是45cm，现在要改成60cm，如果起点的那根不动，再隔多远又有一根电线杆不必移动？

数学题解答：从起点的电线杆到不必移动的电线杆的距离应是45和60的最小公倍数。

算出45和60的最小公倍数即可知距离是多少米，这里需要用到分解质因数的方法。

45＝3×3×5，60＝2×2×3×5

3×5×3×2×2＝180

答：再隔180米又有一根电线杆不必移动。

推荐阅读：
The Most Expensive Domain Sales Ever　 15 Ways Of How Not To Kill Your Leadership Authority　 Study Shows Strong Growth of Tech Inventions to Fight Climate Ch　 Interested in Bitcoins? Here are 10 Blogs You Need to Check Out　 Your Blog’s Been Hacked! Here’s What You Need to Do　 #DiningForBrussels: How Belgium Is Fighting Terrorism With A For　 Many WordPress Site Hackings Caused To These Plugins　 GoDaddy Company Now Hosts New Enterprise-Level Plans　 Using Reduce to Count the Array in Javascript　 Several Algorithms to Compute the Score of Parentheses