1 . 已知两定点
,
,点P是平面内的动点,且
,记动点P的轨迹是W.
(1)求动点P的轨迹W的方程;
(2)圆
与x轴交于C,D两点,过圆上一动点K(异于C,D点)作两条直线KC,KD分别交轨迹W于G,H,M,N四点.设四边形GMHN面积为S,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5799ad0c7fb4bc6ece18d1eb6ed61d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad58326883500e654f384dc80c9cc08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722feac1fba9e2c1af20d81731171e01.png)
(1)求动点P的轨迹W的方程;
(2)圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79fec9ac736204d6e78d80a77c8d6e2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2d4308ce1402c3562f730f95d1d066.png)
您最近一年使用:0次
2 . 下列说法正确的是
①设某大学的女生体重
与身高
具有线性相关关系,根据一组样本数据
,用最小二乘法建立的线性回归方程为
,则若该大学某女生身高增加
,则其体重约增加
;
②关于
的方程
的两根可分别作为椭圆和双曲线的离心率;
③过定圆
上一定点
作圆的动弦
,
为原点,若
,则动点
的轨迹为椭圆;
④已知
是椭圆
的左焦点,设动点
在椭圆上,若直线
的斜率大于
,则直线
(
为原点)的斜率的取值范围是
.
①设某大学的女生体重
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9ba38a31c1aa6827df859474a35d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be6e964c405a9cdf6623f9219898fd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655f9094c1dd6b53c4d24665c8d69f82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc82298042000a3dc907f6c7211e0324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fd17f45e1149748e8b8c336f9b9ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffd8b2185a6f0e8fcd6ebfe9b785fcc2.png)
②关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80753c2a3a6e7a4f344e04e4c45100d9.png)
③过定圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48ed960a1ec0e2061a733c025461b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
④已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cae00bdc6f8b564b6b15b32572c848b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b13e94abcd29afc632ae3b0f505fb3.png)
A.①②③ | B.①③④ | C.①②④ | D.②③④ |
您最近一年使用:0次