数学是学习物理最好的工具。一些物理计算题,特别是物理竞赛的计算题,如果我们能运用数学解题方法和技巧,能使问题简单化、条理化,有的习题看似束手无策,经过数学分析、推理,会出现“柳暗花明、豁然开朗”的效果。本文以一道求解电功率极大值的习题为例,剖析数学知识在物理解题中的妙用。 Mathematics is the best tool for learning physics. Some physics calculation questions, especially the physics competition calculation questions, if we can use mathematical solution methods and techniques, can make the problem simple and organized, and some exercises seem helpless, through mathematical analysis, reasoning, there will be Wicked, suddenly " The effect. This paper takes an exercise of solving the maximum of electric power as an example to analyze the magical effect of mathematical knowledge in solving physical problems.