在循环小数0.ABCD中，小数部分前90位上的数字和是180，这个循环小数的循环节最大是多少？最小是多少？

在循环小数0.ABCD,我记得好像以前做的是在循环小数0.ABC.可能是奥数选拔时做的,

∵（A+B+C）*30=180
∴A+B+C=6
分情况讨论
(1)∵最小值：A小于B小于C
∴A=1 B=2 C=3
(1)∵最大值：A大于B大于C
∴A=3 B=2 C=1
综上：此循环小数为0.123 或0.321
你自己参考一下吧.错了别拍我

180/90*4=8
所以是0.800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000800080008000