一个数倒过来看是正着看的1.5倍
- 时间:2020-06-22 15:49:22
- 分类:数学世界
- 阅读:95 次
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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