Two operators are opposites or inverses if their combined mapping is the identity mapping. Less technically, one mapping must reverse the effect of the other.
There are problems, though, when dealing with even fairly common functions. Squaring is a function from the real numbers to the non-negative real numbers, but there is not a single inverse operation. [+sqrt and -sqrt are the two inverse functions over the range.]
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Inverse means opposite so division is the opposite of multiplacation
The answer depends on what you mean by "opposite": whether it is the additive inverse or the multiplicative inverse.
Inverse is the opposite of proportion
direct
If by "opposite" you mean its additive inverse, the answer is 0. If by "opposite" you mean its multiplicative inverse, for the number x, it will be (x+1/x).