【摘要】 Ｌａｇｒａｎｇｅ 中值定理的传统证法都是事先构造一个辅助函数，然后利用Ｒｏｌｌｅ 定理的结论来完成的。本文尝试另辟新径，避免引入辅助函数而直接用坐标旋转变换来证明Ｌａｇｒａｎｇｅ中值定理。更多还原

【Abstract】 The traditional demonstration of Lagrange mean value theorem is structure a supplementary function in advance,then use the conclusion of Rolle theorem to complete it.In this article,the author attempts to make a fresh start,demonstrate Lagrange mean value theorem directly by coordinate revolution transformation.更多还原