Answer: 1/9
Explanation: these types of repeating decimals are equivalent to the fraction that has the number doing the repeating in its numerator and the number 9 in its denominator.
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The answer is 5r^2 -1
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Remember to change into a top heavy fraction, so 9 1/2 - 6 1/2 =

, so 19-3 =16; so 16/2 =8