PREP数学一问,谢谢！

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

有好心人能解答嘛？

试帮你解答一下：

这道题其实就是从０－１分５段和７段．然后像邻两段相减看哪个值最小．

换个形象点的说法，你在1米的距离之内摆上4块红砖（也就是把这1米分成5份），又在这1米的距离之内摆上6块绿砖（也就是把这1米分成7份），问相邻的一块红砖和绿砖之间的最小距离是多少。