If the x power of a is equal to n (a >; 0, and a is not equal to 1), then the number x is called the logarithm of n with a as the base, and is recorded as x=logaN. Where a is called the base of logarithm and n is called real number.
Calculation method:
According to 2 3 = 8, we can get log2 8=3.
Extended data
Arithmetic of logarithm:
1、log(a) (M N)=log(a) M+log(a) N
2、log(a) (M÷N)=log(a) M-log(a) N
Log (m n = nlog (a)
4、log(a)b*log(b)a= 1
log(a) b=log (c) b÷log (c) a
Algorithm of exponent:
1, [a m] × [a n] = a (m+n) is the same as the base power, the base number is constant, and the exponents are added.
2.[a m]⊙[a n]= a(m-n) Divide by the power with the same base, and subtract the exponent with the same base.
3. [a m] n = the power of a (Mn), the cardinality is unchanged, exponential multiplication?
4. The power of the product of [ab] m = (a m) × (a m) is equal to the power of each factor, and then multiplied by the obtained power.