研究动点的轨迹是对动点运动结果的一种深刻理解,明确动点的轨迹之后再利用轨迹的几何性质解题,往往可以起到另辟蹊径、化繁为简的作用.下面通过三道例题加以说明.例1已知抛物线y2=x,经过此抛物线的焦点和点M(1,1),且与其准线相切的圆有 Studying the trajectory of the moving point is a deep understanding of the moving result of the moving point. After the trajectory of the moving point is clarified, the geometric nature of the trajectory can be solved to solve the problem, which often can play a different role and simplify the movement. Example 1 It is known that the parabola y2 = x passes through the focal point of this parabola and the point M (1,1), and the circle tangent to the line has