一个数倒过来看是正着看的1.5倍。猜猜是几？题目如下：一个三位数，写在一张纸上，倒过来看是正着看的1.5 倍，正着看是倒过来看的2/3。这个三位数是几？

分析与解：这个三位数是666。其实，只要你稍加思索，就可以想出来了。这道题如果要求找一个一位数，那就是6；找一个两位数，则是66；找一个四位数，则是6666，……，依此类推。关键是要知道6和9这两个数字是可以倒过来互相转化的，而且它们正好符合题中的数量关系。

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