1/ (-2/10) = -10/2 = -5
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-2 (negative two) The multiplicative inverse (reciprocal) for a number x is 1/x.
-2/3 -> [mult.inverse] -> -3/2 which is -1½or -1.5 ; note that a number, when multiplied by its multiplicative inverse will have a product of 1. So if you multiply these two you get 6/6 which equals 1 [negative times negative is positive].
25/6 = 17/6 so the multiplicative inverse is 6/17.
multiplicative inverse
Let A and B be any two numbers such that AB=1. An example would be 1 and 1/9.We say that A is the multiplicative inverse of B. Similarly we say that B is the multiplicative inverse of A.