A superscript 2 above any number means that number is multiplied by itself. This is called a squared number. If this is over a fraction, then it could either apply to just the numerator or the entire fraction depending on whether or not there are brackets.
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Yes.
Multiply the first fraction by the reciprocal of the second. That is, flip the second fraction over and then multiply the two.
If you mean: 2 and 205/1000 then as a simplified fraction it is 441/200
5 over 2
There are two answers; -27 over 2, or 27 over -2.