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解析几何中的定值问题是近几年高考命题的热点.这类问题往往很难找到解题的切入口,一般学生通过盲目探索之后,只能是望题兴叹了,可以说是高考题中的一大难点.解决这些问题的思维障碍在于:一是所要寻找的定值是什么?二是面对字母运算不得要领,难以找到合理的突破口而陷于繁杂的运算.本文通过典型例题的分析,介绍几个解决这类问题的常用策略.一、三角代换法例1(2012年上海高考题)在平面直角
Analysis of fixed values in the geometry of the college entrance examination in recent years, the proposition of the hot spots. Such problems are often difficult to find the entry point to solve problems, the general exploration of the blind through the blind only hope that the problem can be said that the college entrance examination questions One of the obstacles to solve these problems is: First, what is the value you are looking for? Second, the face of the letter can not calculate the essentials, it is difficult to find a reasonable breakthrough and stuck in complex computing.Through the analysis of typical examples, Introduce several common strategies to solve such problems First, the Triangle Substitution Law 1 (2012 Shanghai Entrance Examination) at right angles to the plane