题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-89192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-26762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-78798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-70832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-53340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-83819.png)
(1)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-75823.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-78798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-53383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170000-44425.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170000-37334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170000-14856.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170000-17330.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-83819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170000-85431.png)
又因为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-83819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170000-79636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170000-59164.png)
⑵ 由⑴得,椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170000-59607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170000-96923.png)
因为直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-78798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-53383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-78798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170001-20214.png)
故直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165959-78798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170001-41999.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170001-17062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170001-96055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170001-42357.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170001-55924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170002-38660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170002-22588.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170002-64066.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170002-25810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023170003-92907.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165946-38746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165946-20797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165946-38464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165946-42271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165946-59508.png)
(1)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165947-89034.png)
(2)求DABO(O为原点)面积的最大值.
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165936-76672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165936-55340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165936-37670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165936-76672.png)
A.(0,![]() ![]() | B.(![]() ![]() | C.(0,![]() | D.[![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165929-82094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165929-82228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165930-58324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165930-49762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165930-82490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165930-34849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165931-57015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165931-20626.png)
A.50 | B.35 | C.32 | D.41 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165914-88655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165914-66723.png)
条准线的方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165914-69099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165914-27985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165914-67334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165915-78857.png)
且与椭圆交于
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165915-67575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165915-40270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165915-83278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165915-76776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023165914-67334.png)
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