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二次函数在区间上的最值,常与二次函数的开口方向和对称轴以及给定的区间有关,一般要结合图象讨论对称轴与给定区间的相对位置关系.1开口定、对称轴定、区间定
The maximum value of the quadratic function in the interval is often related to the opening direction and the symmetry axis of the quadratic function as well as the given interval. Generally, the relative positional relationship between the axis of symmetry and the given interval is to be discussed in combination with the image. Axis determination, interval determination