3 / 1/3 is equal to saying 3/1 / 1/3

And so, we apply the rule of “product of extremes divided by product of mids” --> we have that 3/1 / 1/3 = (3*3)/(1/1).
We could also say “We apply the inverse of the denominator to bring it up into the numerator” and the result is the same: 3 / 1/3 = 9.
I agree with other commenters that the answer could be 1 if we go strictly from left to right and no brackets are added.

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