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本文笔者认为一道竞赛试题解答有误 ,用两种解法加以说明 ,并进一步通过例题的分析和解决将两个形同而质不同的问题进行了比较 ,强调用微元法处理问题时应注意 :等价无穷小量可以互相替代 ,而同阶无穷小量不可互相替代 .原题 略 (详见第十七届全国中学生物理竞赛预赛试卷第四
The author of this paper believes that the answer to a competition question is erroneous. It uses two kinds of solutions to explain it, and further analyzes and solves two problems that are of the same quality and different quality through the analysis and solution of the examples. It is emphasized that when dealing with problems with the microelement method, attention should be paid to: Equivalent infinitely small quantities can be substituted for each other, and infinitesimal quantities of the same order cannot be replaced with each other. The original title is omitted (for details, see the Seventeenth National Junior High School Physics Contest Preliminary Test Paper No. 4