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MantissaExponent
 MantissaExponent[x] gives a list containing the mantissa and exponent of a number x.
MantissaExponent[x, b] gives the base-b mantissa and exponent of x.
Example: MantissaExponent[3.4 10^25]   .
The mantissa always lies between  and  or  and  .
MantissaExponent works with exact as well as approximate numeric quantities.
Example: MantissaExponent[Exp[Pi], 2]  .
See The Mathematica Book: Section 3.1.3.
See also: Log, RealDigits, IntegerExponent.
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