题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010537-29276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010538-62111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010538-21783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010538-82135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010538-19071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010539-60953.png)
A.7 | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:由于椭圆方程
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010538-62111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010540-26518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010540-75384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010540-93453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010540-63058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010540-80736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010541-20770.png)
点评:解决焦点三角形的面积,主要根据直线与椭圆相交,得到交点的坐标,进而确定出三角形的高度,利用面积公式来得到结论,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010526-64741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010526-31111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010527-43575.png)
的另一焦点在
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010527-74679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010527-60874.png)
设双曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010517-75184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010517-65874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010517-19985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010517-11311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010518-86238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010517-75184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010518-91582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010518-52501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010517-19985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010517-11311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010518-34856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010519-78391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010519-46410.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010519-46410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010519-84143.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010517-75184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010519-84143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010519-34141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010520-92588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010520-75770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010520-92588.png)
如图椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010505-91832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010505-61164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010505-94131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010505-57943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010506-27486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010506-59829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010506-61091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010506-76023.jpg)
(1)求此时椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010505-91832.png)
(2)设斜率为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010507-93871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010507-28521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010505-91832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010507-12842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010507-34815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010507-16898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010508-60199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010508-16100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010507-12842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010507-34815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010508-19800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010508-93292.png)
如图,已知点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010450-77065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010450-98510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010450-80598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010450-78454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010451-14356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010451-60298.png)
(1)求椭圆的方程;
(2)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010451-85672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010451-66910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010452-55232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010452-41637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010440-12009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026010440-67957.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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