题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000510-87361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000510-99054.png)
(1)求曲线C的方程
(2)过点D(0,-2)作直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-41496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-35053.png)
(O为原点),求四边形OANB面积的最大值,并求此时的直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-41496.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-18936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-41496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-37321.png)
解析
试题分析:解(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-23932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000510-87361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-64627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-64627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-52543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-25654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000510-99054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-64627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-23932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-52543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-64627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000513-92246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-64627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-18936.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-35053.png)
当直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-41496.png)
当直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-41496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-41496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-41496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000513-46574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000513-71478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000514-85125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000514-38183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000514-11753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000514-75204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000515-54994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000515-10972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000515-40434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000515-75375.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000515-49632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000516-54260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000516-90785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000516-97455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000517-98148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000517-96491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000517-37043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000517-74425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000517-96491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000518-69413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000512-64627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000518-70258.png)
所求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-41496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000511-37321.png)
点评:主要是考查了运用代数的方法来通过向量的数量积的公式,以及联立方程组,结合韦达定理来求解,属于中档题。
核心考点
试题【已知两定点E(-2,0),F(2,0),动点P满足,由点P向x轴作垂线段PQ,垂足为Q,点M满足,点M的轨迹为C.(1)求曲线C的方程(2)过点D(0,-2)作】;主要考察你对曲线与方程的应用等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000448-75275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000448-60671.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000449-97390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000449-86746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000449-97390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000449-77941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000449-60613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000450-78985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000450-36530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000450-32978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000450-36530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000450-76363.png)
(1)求曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000450-76363.png)
(2)过点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000451-14459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000451-19787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000450-76363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000452-94558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000452-88195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000452-47420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000452-82457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000453-52260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000453-11210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000451-19787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000445-28389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000435-85477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000435-66098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000435-68684.png)
求切线段长的最小值。
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000421-63237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000421-53199.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000410-79735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000411-73429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000411-50410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000411-82883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000411-26217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000412-20565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000412-71927.png)
(Ⅰ)求抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000410-79735.png)
(Ⅱ)已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000412-44962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000410-79735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000413-35416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000412-44962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000413-52218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026000413-30788.png)
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