What are the inverse numbers

The inverse function and the original function are symmetric with respect to y = X
The necessary and sufficient condition for the existence of inverse function is that the domain of definition and the domain of value of function are one-to-one mapping;
As long as there are too many inverse functions
For example, common y = a ^ X and y = loga X
For example, y = KX + B, then x = (y-b) / K
So the inverse function of y = KX + B is y = (X-B) / K

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