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教材中有个很有启发性的探究性问题:点M0(x0,y0)在圆x2+y2=r2内的条件是什么?在圆x2+y2=r2外呢?(答案x02+y02r2).判断点与圆、直线与圆的位置关系的一个很重要的
There is a very instructive question to ask in the textbook: what is the condition for the point M0 (x0, y0) in the circle x2 + y2 = r2? What is the difference between the circle x2 + y2 = r2? (Answer x02 + y02 r2). Judging the point and the circle, the relationship between the position of a straight line and a very important