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Properties of Rational Numbers - Reciprocal

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let `-5/7` must be multiplied by `7/-5` so as to get the product 1. 
We say that `7/-5` is the reciprocal of `-5/7`.
We say that a rational number `c/d`  is called the reciprocal or multiplicative inverse of  another non-zero rational number `a/b` if ` a/b xx c/d = 1`. 

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