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二次函数是函数中最基本最简单的函数之一,同时也是其他数学知识的载体.二次函数在某一区间上的最值问题,是初中二次函数内容的继续,随着区间的确定或变化,以及系数中参变数的变化,使其又成为高考数学的热点.一、常系数二次函数在定区间上的最值例1函数y=-x2+4x-2在区间[0,3]上
The quadratic function is one of the most basic and simple functions in the function, and it is also the carrier of other mathematical knowledge. The problem of the maximum value of the quadratic function in a certain interval is the continuation of the contents of the quadratic function in the junior high school, with the determination of the interval. Or changes, and changes in the number of parameters in the coefficient, which make it a hot spot in college entrance examination mathematics. First, the constant value of the quadratic function of the constant coefficient in a fixed interval Example 1 Function y=-x2+4x-2 in the interval [0 , 3] on