请教Prep-PS2-108

triangel8866

on the number line, the segment from 0 to 1 has been divided into fifths, as indicated by the larger tick mark and also into sevenths as indicated by the small tick marks. What's the least possible distance between any two fo the tick marks.
1/70
1/35
2/35
1/12
1/7
答案是B
不知到怎么计算的， 请教！

lovesiqi4665

这种题目试错最好；

一种是5等分，另一种是7等分；于是标记所在的位子为5/35,7/35,10/35,14/35,15/35,20/35,21/35,25/35,28/35,30/35；

看一眼上面的，就知道是B了。

Pythagoras

这不明显有１/35，为什么选Ｂ