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以下一类系数含参变量的二次问题 :已知二次函数在某闭区间上的最大 (或最小 )值 ,求参变量的值 ;已知二次不等式在某闭区间上为绝对不等式 ,求参变量的取值范围等 ,是常见的一类二次问题 .解这一类问题 ,通常是通过考察相应的二次抛物线的开口方向以及与所给的闭区间的位置关
The following type of coefficient has a quadratic problem with a parameter: Knowing the maximum (or minimum) value of a quadratic function over a certain closed interval, finds the value of a parameter; Known quadratic inequalities are absolute inequalities over a certain closed interval, Finding the range of values of parameter variables is a common type of quadratic problem. Solving this type of problem usually involves examining the opening direction of the corresponding secondary parabola and the position of the given closed interval.