Logarithmic function is a function with power (real number) as independent variable, exponent as dependent variable, and base number as constant. If ax=N (a>0, and a ≠ 1), then the number x is called the logarithm with a as the base N, recorded as x=logaN, and read as the logarithm with a as the base N, where a is called the base of the logarithm, and N is called the true number. Strengthen the exercise of logarithmic function, the exercise of converting exponential to logarithmic, and the exercise of logarithmic function calculation to make you familiar with logarithmic function.