论文部分内容阅读
换元思想是一种重要的数学思想方法.换元法又称辅助元素法、变量代换法,它通过引进新的变量把分散的条件联系起来,隐含的条件显露出来或者把条件与结论联系起来,将陌生的结构变为熟悉的形式,把复杂的计算和推证简化,换元的实质是转化.本文主要针对笔者在最近高三复习课中遇到的一类具x~2+y~2的结构问题,利用三角换元法将问题化归到我们熟悉的模型中来,转变一种解决问题的思路,与广大读者交流,欢
The idea of changing yuan is an important method of mathematical thinking.Also known as the auxiliary element method, variable substitution method, it introduces new variables to connect scattered conditions, the hidden conditions revealed or the conditions and conclusions The strange structure into a familiar form, the complex calculation and simplification of deduction, the essence of change yuan transformation.This paper mainly for the author in the recent high school review class encountered a class with x ~ 2 + y ~ 2 structural problems, the use of trigonometry for the problem into the familiar model, to change a way to solve the problem, communicate with the majority of readers, Huan