The only real (or complex) number which does not have a multiplicative inverse is 0.
There is nothing you can multiply by 0 to get 1.
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No, it does not.
For every real number, x, which is not zero, there exists a real number x' such that x * x' = x' * x = 1, the multiplicative identity.
Multiplicative inverse.
For any two non zero integers a and b, a/b x b/a = 1 ------------------------------------- For every number a ≠ 0 there is a number denoted by a^-1 (a to the power -1) such that: a × a^-1 = a^-1 × a = 1
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