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随着课改的推进,对直线和圆的考查,主要以直线和圆的位置关系为主,题目难度适中,既着重对基础知识的考查、更注重对基本技能的考查.求解直线与圆相交的问题,常用方法有几何法与代入消元法,两者相辅相成,相互统一;针对与相交弦有关的垂直问题,笔者巧妙地构造了辅助圆,将直线与圆的问题转化为圆与圆的问题使问题的解答得以简化.下面看具体的几个例子.一、建立等式,求参数
With the advancement of curriculum reform, the examination of straight lines and circles mainly focuses on the relationship between the positions of lines and circles. The difficulty of the topics is moderate, which not only focuses on the examination of basic knowledge but also focuses on the examination of basic skills. , The common methods are the geometric method and the substitution elimination method, which are mutually reinforcing and mutually unifying. For the vertical problems related to the intersection chord, the author cleverly constructs the auxiliary circle, which transforms the problem of the line and the circle into the circle and the circle Problems to simplify the problem to answer the following to see a few specific examples. First, the establishment of equations, seeking parameters