To express the fractions as repeating decimals:
- 0.77777... is \( \frac{7}{9} \) (repeats '7' infinitely).
- 0.811811811... is \( \frac{811}{999} \) (repeats '811' infinitely).
- 0.72727272... is \( \frac{72}{99} = \frac{8}{11} \) (repeats '72' infinitely).
- 0.6 is \( \frac{6}{10} = \frac{3}{5} \) (non-repeating).
If you need further details or calculations behind these fractions, please let me know!