Yes, they are.
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Yes they are.A terminating number such as a.bcdef is equivalent to abcdef/1000000. A repeating number such as a.bcdbcd... is equivalent to abcd/999 [the number of 9s is the length of the repeating string of digits.] So, in both cases the number can be written in the form of p/q where p and q are integers and q > 0.
Yes, of course. Different denominators in the rational equivalent give rise to different lengths of repeating strings.
It is 5/9 because it is equivalent to 0.55555...repeating
It is rational because it can be expressed as the ratio 400040004/10000000000.
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