题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000957-68545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000957-19912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000957-68545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000957-52014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000958-68899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000957-68545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000958-97449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000958-65551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000958-84742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000957-68545.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:由已知条件易得直线l的斜率为k=kFN=1,
设双曲线方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001000-82936.png)
则有
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001000-41732.png)
两式相减并结合x1+x2=-24,y1+y2=-30得,
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001000-48957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026001001-96105.png)
即4b2=5a2,又a2+b2=9,解得a2=4,b2=5,故选B.
点评:中档题,涉及弦中点问题,往往可以利用“点差法”,得到斜率的表达式。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000950-65716.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000945-88978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000946-26473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000946-47831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000946-50442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000946-86097.png)
A.![]() | B.![]() | C.2 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000940-23514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000940-59248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000940-96949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000940-58819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000941-32939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000941-66166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000927-94896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000928-65238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000928-41261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000928-65238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000928-39826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000928-99461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000929-10354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000929-87537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000929-23537.png)
(Ⅰ)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000930-25842.png)
(Ⅱ)若过
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000930-76796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000930-25842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000930-99245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000930-11506.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000931-78303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000930-25842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000931-28138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000931-55484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000931-96408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000921-81029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000921-45832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000921-73346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000921-81029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000921-74073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000922-31669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000922-40103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000922-86298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000922-24591.png)
A.![]() | B.![]() | C.![]() | D.![]() |
最新试题
- 145Kg最接近下面哪一个物体的质量? ( ) A.一个大苹果B.一位中学生 C.一个橡皮擦 D.一头大象
- 2His brother wants _____ a teacher. [ ]A. is
- 32009年国庆60周年庆典一定让你过目难忘, 60年的峥嵘岁月,60年的光辉历程,60年来,中国共产党领导中国人民取得了
- 4下列化学反应的离子方程式正确的是A.用小苏打治疗胃酸过多:B.往碳酸钙中滴加稀盐酸:C.二氧化碳通入足量的氢氧化钠溶液:
- 5读图,回答下列问题:(18分)(1)甲、乙两图中,比例尺较大的是 图。(2)分析乙图中南端和北部的气候
- 6 2011年3月11日云南德宏州盈江县发生5.8级地震,造成25人遇难,34万人受灾。县城教学楼被震裂,学校处于停课状
- 7造成地球日益变暖的主要原因是:[ ]A.人口数量日益增大 B.地震日益增多 C.大气中二氧化碳含量大 D.大气中
- 8阅读下面的文言文,完成5—9题。(22分)张 平 传张平,青州临朐人。弱冠寓单州,依刺史罗金山。金山移滁州,署平马步都虞
- 9随着经济的发展,我国北方城郊建有大面积温室大棚,冬季市民餐桌上常有西红柿、黄瓜等夏季蔬菜、水果。回答以下问题小题1:用“
- 10下列比较中错误的是[ ]A.沸点:NH3 >AsH3 >PH3B.熔点:金刚石>晶体硅>
热门考点
- 1近年来,你走在上海街头会发现不少公交车和出租车印有“CNG”的标志,请回答:(1)上海市政府推行这一改革的主要目的是__
- 2对于算式20072-2007,下列说法不正确的是( )A.能被2006整除B.能被2007整除C.能被2008整除D.
- 3下列实验操作中正确的是( )A.给试管内的液体加热时,试管口对着人B.把烧杯放在铁圈上直接加热C.用天平称量时,把称量
- 4— he English?—No, not. Chinese.
- 5放大镜在任何情况下都成放大的虚像______.
- 61949——2011年的新中国走过了60多年的光辉历程,她承载着历史的沧桑,沉积着不同时期中国人民的深刻记忆。阅读下列材
- 7中国共产党第十八次全国代表大会闭幕后,我国各民主党派陆续召开了全国代表大会。在总结过去经验时,各民主党派不约而同地提到,
- 8请你写出一个比3小的无理数,这个无理数可为:______.
- 9已知分式2x+1x-2:当x=______时,分式没有意义,当x=______时,分式的值为0,当x=-2时,分式的值为
- 10在常温下,碳的化学性质______.