涉及函数概念的题目种类繁多,灵活性强.要解决好函数的综合问题,关键是运用函数思想,站在函数的高度上俯视、统摄与函数相关的数学知识,使问题的脉络清晰,思路简明,利于解决.例析如下:1函数图像的运用1·1数形结合求参数的范围例1若不等式x2-logax0对x∈0,21恒成立,求实数a的 Concerning the concept of function, there are a great variety of topics and strong flexibility. The key to solving the comprehensive problem of functions is to look down the function height and look down on the mathematical knowledge related to the function by using the function idea, so that the problem context is clear and the thinking is concise , To solve.Examples are as follows: 1 The use of function images 1.1 The number of parameters in the form of combination with the example 1 If the inequality x2-logax0 x∈0,21 constant holds, the real number of a