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：
How to Create Sponsorship Proposals For Your Blog　 7 Top Investment Blogs For Newbie And Veteran Investors　 Algorithm to Find the Winner on a Tic Tac Toe Game　 The PUSHD/POPD Implementation in Pure Windows Batch　 Three ways to Reverse a List/Array/Tuple in Python　 How to Compute the Interval List Intersections using Two Pointer　 How to Summary Ranges using O(N) Two Pointer Algorithm?　 Microbit Programming: How to Make a Catching-Apple Game by Using　 The enumerate method in Magik Programming　 Add Two Numbers by Two Linked List (most significant digit comes