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最值问题是竞赛数学、高中数学中的重要题型,它内容丰富,涉及面广,解法灵活多变,因而倍受命题者的青睐,本文介绍最值问题的一些求法,以供参考. 1.判别式法若方程ax2+bx+c=0(a≠0)有实根,则△=b2-4ac≥0.
The most important question is an important question in competitive mathematics and high school mathematics. It is rich in content, covers a wide range, and is flexible and varied. Therefore, it is favored by propositioners. This article describes some of the methods for determining the most valued issues for reference. Discriminant method If the equation ax2 + bx + c = 0 (a ≠ 0) has a real root, then △ = b2-4ac ≥ 0.