对数函数是高中数学中的一种重要函数 ,也是高考的热点知识之一 .学习对数函数常会遇到一些难点 ,使解题思维陷入困境 ,归纳起来主要有三大难点 .难点一 :底数不统一对数的运算性质及相关的都是建立在底数相同的基础上的 ,但在实际问题中 ,对数的运算、变形却经常要遇到底数不 Logarithmic function is an important function in high school mathematics, and it is also one of the hot topics in college entrance examination. Learning logarithm function often encounters some difficulties, so that the problem-solving thinking is in trouble, summed up in three major difficulties. Difficult one: the base number is not The operational nature of the unified logarithm and the related ones are based on the same base number. However, in practical problems, the logarithm operation and deformation often have to meet the base number.