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1问题的提出在高三复习到点与圆、直线与圆的位置关系时,笔者为学生出了一道全日制普通高级中学教科书《数学》第二册(上)(试验修订本.必修)上的例题(P75例2):已知圆C的方程为x2+y2=r2,求经过圆上一定点M(x0,y0)的切线方程.由于是高三复习课,强调的是知识的前后联系,使知识形成
1 problem raised in the third year to review the point and the circle, the relationship between the position of a straight line and a circle, the author out of a full-time junior high school textbook “mathematics” second book (on) (trial version of the compulsory) Example (P75 Example 2): Knowing that the equation for circle C is x2 + y2 = r2, find the tangent equation that passes through a point M (x0, y0) on the circle.Because it is a high school review, emphasizing the context of knowledge, Make knowledge