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二次函数在某区间上的最值问题是高考命题中经久不衰的“热点”。本文就二次函数图象的对称轴与所给区间的“定”和“变”,将这类问题分为四种类型,并分别举例加以深刻剖析,旨在探索
The problem of the value of the quadratic function in a certain interval is the enduring “hot spot” in the college entrance examination proposition. In this paper, we classify these problems into four types for the “set” and “change” of the symmetry axis of the quadratic function image and the given interval, and give examples for deep analysis.