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Base (exponentiation)
In exponentiation, the base is the number b in an expression of the form bn.
==Related terms==
The number n is called the exponent and the expression is known formally as exponentiation of b by n or the exponential of n with base b. It is more commonly expressed as "the nth power of b", "b to the nth power" or "b to the power n". For example, the fourth power of 10 is 10,000 because 104 = 10 x 10 x 10 x 10 = 10,000. The term ''power'' strictly refers to the entire expression, but is sometimes used to refer to the exponent.
==Roots==
When the nth power of b equals a number a, or a = bn , then b is called an "nth root" of a. For example, 10 is a fourth root of 10,000.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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