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I don't understand how to manipulate numbers with repeating decimal in Wolfram Mathematica language.

For example `0.3...`

does not work as input and I don't see how to add a vinculum to indicate the repeating part either. There's no manual or something on the issue on the net. Something strange and unusable `0.12(34)^_ (repeating decimal)`

is given by Wolfram Alpha.

7It's probably easiest to just add it as a fractional term if you need arbitrary precision

`12/100+(34/99)/100`

. – eyorble – 2021-02-25T01:16:30.033