物理和数学是关系非常紧密的两门学科,在物理解题中适当运用数学技巧,能让学生更深入了解题目的物理意义,增加交叉运用学科的能力。利用二次方程判别式“Δ”处理物理问题,就是一种很好的教学方法。在最值和边界问题中利用“Δ”处理物理问题的关键是 Physics and mathematics are two closely related disciplines. Appropriate use of mathematical techniques in solving physical problems enables students to gain a deeper understanding of the physical meaning of the subject and increase the ability to cross-discipline subjects. Using the quadratic discriminant “Δ ” to deal with physical problems is a good teaching method. The key to using “Δ ” to deal with physical problems in the most value and boundary problems is