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9/3 is 3 and is not a mixed number. Unless you want to write it as 30/n where n is any positive integer. A bit pointless, though.
Suppose n/d is an improper fraction where, by definition, n > d.Divide n by d to give a quotient q and a remainder r. Then the equivalent mixed number is q r/d.
19 is an integer, so the only way to express it as a mixed number might be 190/n where n is any number (other than zero) that you want. Pointless, but that's the only answer.
10m/n for any pair of counting numbers m and n such that m < n
12 over 1 is the integer 12; it is not a mixed number. You could write it as 120/n where n is any non-zero integer but why would you do that? It would be a pointless exercise.