2011年湖南高考数学必考点题型热点预测与分析(5)解析几何romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone unspoken rules, formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well2011年湖南高考数学必考点题型热点预测与分析 命题热点五 解析几何 高考对解析几何的考查主要包括以下内容:直线与圆的方程、圆锥曲线等，在高考试卷中一般有12个客观题和1个解答题，其中客观题主要考查直线斜率、直线方程、圆的方程、直线与圆的位置关系、圆锥曲线的定义应用、标准方程的求解、离心率的计算等，解答题则主要考查直线与椭圆、抛物线等的位置关系问题，经常与平面向量、函数与不等式交汇等，考查一些存在性问题、证明问题、定点与定值、最值与范围问题等，解析几何试题的特点是思维量大、运算量大，所以应加强对解析几何重点题型的训练. 22l:l预测1. 如果圆关于直线对称，则直线的斜率mxy，,410(3)(1)1xy，,等于. ,，,3410mm,1解析:依题意直线经过点，所以，于是mxy，,410(3,1),1直线斜率为. k,4动向解读:本题考查直线方程与斜率、圆的方程、对称等基本问题这是解析几何的基础内容是高考的重点内容一般以选择题、填空题的形式考查有时也间接考查与圆锥曲线的内容综合起来进行考查. 22xy,1预测2. 已知双曲线的左右焦点分别是，P点是双曲线右支上一点，FF,12916且，则三角形的面积等于. |PFFF,PFF21212a,3解析:由已知可得，而，所以|210FFc,|26PFPFa,1212，又，所以可得三角形的面积等于|16,|10PFPF,|10FF,PFF121212122S,，,1610848. 2动向解读:本题考查双曲线的定义、三角形面积的计算等问题是一道综合性的小题.尽管高考对双曲线的考查要求不高但对于双曲线的定义、离心率、渐近线等知识点的考查却常考常新经常会命制一些较为新颖的考查基础知识的小题目.解答这类问题要善于运用双曲线的定义善于运用参数间的关系求解. 22xyP，,1(0)ab预测3.已知椭圆，是椭圆上关于原点对称的两点，是MN,22ab1PMPN、kk,kk、椭圆上任意一点，且直线的斜率分别为，若，则椭圆的离心率12124为 1232A. B. C. D( 2223yyyy,，00PxyMxyNxy(,),(,),(,),kk,解析:设，则，依题意有000012xxxx,，00romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone unspoken rules, formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as wellromoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone unspoken rules, formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflic