再隔多远又有一根电线杆不必移动
- 时间:2020-05-23 15:41:47
- 分类:数学世界
- 阅读:163 次
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。
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