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二次函数是十分重要的基本初步函数 ,是解决高中数学问题的重要基础 ,其应用十分广泛 纵观近十年高考题 ,以二次函数为背景的不等式问题作为代数推理题在高考中频繁出现 二次函数和绝对值不等式相结合的题目也在高考中出现多次 ,如 1996年全国高考卷第 2 5题 ,2 0 0 2年江苏
The quadratic function is a very important basic preliminary function, and it is an important foundation for solving high school mathematics problems. Its application is very extensive. Looking at the college entrance examination questions in recent ten years, inequalities with quadratic functions as background are frequently used as algebraic reasoning questions in college entrance examination. The problem of the combination of quadratic function and absolute value inequality also appears many times in the college entrance examination, such as the 1996 National College Entrance Examination Volume 25, Jiangsu Province in 2002.