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函数是中学数学的重要内容之一,在高考和竞赛中都占有十分重要的地位,在实际生活中也有广泛的应用.关于函数常见的问题有:求定义域、值域(最值),求函数值,判断函数的单调性和奇偶性,画函数图象,求函数表达式,利用函数方法解题等,其中,函数表达式即是通常所说的函数方程,笔者将在下期专门讨论,本讲仅就我们现有的知识对其余问题介绍一些解法.
Function is one of the important contents of middle school mathematics. It plays an important role in the college entrance examination and competition. It also has a wide range of applications in practical life. The common questions about functions are: the definition of the domain, the value domain (the most value), seeking Function values, determine the monotonicity and parity of functions, draw function images, find function expressions, solve problems using function methods, etc., where function expressions are commonly referred to as function equations, and the author will discuss them in the next issue. This lecture will only introduce some solutions to the rest of the problems with our existing knowledge.