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圆锥曲线是解析几何的重要内容之一,也是高考考查的重点和热点,知识综合性较强,对学生逻辑思维能力、计算能力等要求很高,这些问题重点考查学生方程思想、函数思想、转化与化归思想的应用.定值问题与定点问题是这类题目的典型代表,为了提高学生的解题效率,特别是高考备考效率,笔者列举了一些典型的定点和定值问题,以起到抛砖引玉的作用.例1在平面直角坐标系xOy中,已知椭圆x~2/9+y~2/5=1的
Conic curve is one of the important contents of analytic geometry. It is also the focus and hot spot of college entrance examination. The comprehensive knowledge is strong and it has high demands on students ’logical thinking ability and computing ability. These questions mainly focus on students’ thought of equations, thinking of functions, And the application of the idea of return to normalization and fixed-point issue is a typical representative of these topics, in order to improve the efficiency of problem-solving, especially the efficiency of the college entrance examination preparation, the author lists some of the typical fixed-point and valuation issues in order to play Example 1 In Cartesian coordinate system xOy, it is known that the ellipse x ~ 2/9 + y ~ 2/5 = 1