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The multiplicative inverse of a number x is , where also applies



The inverse of a fraction is created by exchanging the numerator and denominator. You can write each number as a fraction, and so

  with as the inverse  

You can write the number 2 also as 21 and the inverse as but also as 2–1. These different formats are all used in mathematics.


Example 1

The denominator of a fraction can itself be a fraction


Example 2

Sometimes you will want to simplify an inverse


Example 3

You can use different formats for an inverse


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