我们知道对数函数y=logax(x>0且x≠1,a>0且a≠1)与函数y=logxa(x>0且x≠1,a>0且a≠1)互为倒数,根据这一特点,可以作出函数y=logxa(x>0且x≠1,a>0且a≠1)的图象,我们称其为底对数函数,底对数函数的性质如下: We know that the logarithmic function y=logax (x>0 and x≠1, a>0 and a≠1) and the function y=logxa (x>0 and x≠1, a>0 and a≠1) are reciprocals Based on this feature, an image of the function y=logxa (x>0 and x≠1, a>0, and a≠1) can be made. We call it the bottom logarithm function. The properties of the bottom logarithm function are as follows: