论文部分内容阅读
二次函数f(x)=ax2+bx+c(a≠0)的最值与其定义域密切相关。为了直观说明问题,我们依据二次函数图像抛物线来讨论(抛物线与x轴是否有交点无关)。
The quadratic function f (x) = ax2 + bx + c (a ≠ 0) is closely related to its domain. In order to illustrate the problem intuitively, we discuss it based on the quadratic function image parabola (parabola has nothing to do with the x-axis).