高考试题虽有千般变化,但我们的复习迎考却有一定之规:以不变应万变.这个不变的策略就是抓实基础知识,掌握基本的解题方法和技能,提高运用数学思想方法分析问题、解决问题的能力.本文以2012年江苏卷第19题为例进行分析,希望给高三复习提供一些有益的帮助和启示.一、试题如图1,在平面直角坐标系xOy中,椭圆x2/a2+y2/b2=1(a>b>0)的左、右焦点分别为 Although there are many changes to the high-level test questions, there are certain rules in our review-based examinations: we must not change them. This constant strategy is to grasp basic knowledge, master basic problem-solving methods and skills, and improve the use of mathematical thinking methods. Analyze the problem and solve the problem. This paper analyzes the 19th issue of Jiangsu Volume 19 in 2012 and hopes to provide some useful help and inspiration for the third year review. First, the test is shown in Figure 1. In the plane rectangular coordinate system xOy, the ellipse The left and right focus of x2/a2+y2/b2=1(a>b>0) are