二次函数的应用是初中数学重点知识,也是中考必考内容.但在解题中同学往往因忽视自变量的取值范围而造成失误.下面列举几例供同学参考.例1某水产品养殖企业为指导该企业某种水产品的养殖和销售,对历年市场行情 The application of the quadratic function is the junior high school mathematics key knowledge, but also the exam content.But in the problem-solving students often neglect the range of independent variables caused by mistakes.Following several examples for the reference of students.Example 1 aquaculture Enterprises to guide the business of some kind of aquaculture farming and marketing, market conditions over the years