>>16820700
>>16820762
What if it's none of those ?
Like :
1/3 = 0.333...4

0.99 - 0.65 = 0.34
0.999 - 0.665 = 0.334
0.999999 - 0.666665 = 0.333334

...and so one, you can say then :
0.999... - 0.666...5 = 0.333...4
0.999... - [0.5 + (0.1666...5)] = 0.333...4
0.999... - (0.5 + 1.5/9) = 0.333...4
0.999... - 0.5 - 1.5/9 = 0.333...4
0.4999... - 1.5/9 = 0.333...4
4.5/9 - 1.5/9 = 0.333...4
3/9 = 0.333...4
1/3 = 0.333...4

(it works with anything at the end...)