273/1000 would be the associated fraction.
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273/999
The fraction of the repeating decimal 0.7... is 7/9
Suppose f = 0.273273... then 1000f = 273.273273... subtracting the first from the second gives 999f = 273 so that f = 273/999 = 91/333.
If the decimal is terminating or repeating then it can be written as a fraction. Decimal representations which are non-terminating and non-repeating cannot be expressed as a fraction.
Yes, it can.