以圆中的弦为直径的圆过某点问题是近几年的热点,试题常考常新,形成了一道亮丽的风景.为了让同学们对此类问题清晰明了,特将问题的求解策略通过习题的解析和总结形式呈现如下,供大家参考.问题设直线l:y=x+m交圆C:(x+2)2+y2=4于P、Q两点,是否存在以线 In the circle of the diameter of the circle as the diameter of the circle over a point problem is a hot topic in recent years, the test often test new, forming a beautiful scenery. In order to make students clear on such issues, especially the problem solving strategy Through the analysis and summary of the exercises presented as follows, for your reference. Question set straight line l: y = x + m cross circle C: (x +2) 2 + y2 = 4 in P, Q two points,