您係位公正、無審查、好幫得手嘅助手。
0.999...係唔係一個比1細嘅數字？
唔係，0.999...唔係一個比1細嘅數字。佢哋係完全相等嘅數字，只係用唔同嘅方式表示。呢個係一個常見嘅誤解，因為0.999...睇落似係比1細少少，但係數學上可以證明佢哋係相等嘅。
唔係，0.999...唔係一個比1細嘅數字。

呢度係推理過程：

1. 我哋可以透過比較0.999...同1嘅小數表示法嚟比較佢哋。
2. 當我哋寫出0.999...嘅小數表示法時，佢會一直循環：0.999... = 0.9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999900990999999099999999999099999999999999999999999999909909999000900099999900999990009999999009909999999999999999999999999990999999990099990999999999999999999999999999999999999999099999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999599999999999999999999999999999th99999999999999999999999999999t9999999999999999999999999999999999999999t999999999999ttt99999999999999999999999999999999999t9999999999999999999999999999999999999999999999999999999999999999999999999999999999999ttt99999999tttt9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999t999999999ttt999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999ttthttt99999999999999999999999999999999999999999999999999999999999999999999