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Yes.

If you mean 5.7777 as a terminating decimal it is 57777/10000

If you mean 5.7777... as a recurring decimal where the 7 repeats forever it is 57/9

If a decimal number terminates or repeats one or more digits forever it is a rational number.

Otherwise if a decimal number goes on forever but does not repeat any digits (eg √2 = 1.41421356...) then it is an irrational number.

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14y ago

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