若正四面体
的侧面
所在平面内有一动点
,已知
到底面
的距离与
到点
的距离之比为正常数
,且动点
的轨迹是抛物线,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
更新时间:2023-10-04 20:28:17
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解题方法
【推荐1】如图,四边形ABCD是边长为2的菱形且
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【推荐2】如图,正四棱柱
的底面边长为2,
,E为
的中点,则
到平面EAC的距离为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2025fb058f62e17ba7a16e4b48cdcb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
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【推荐1】下列命题中:
①已知点
,动点
满足
,则点
的轨迹是一个圆;
②已知
,则动点
的轨迹是双曲线;
③两个随机变量的线性相关性越强,则相关系数的绝对值就越接近于1;
④在平面直角坐标系内,到点
和直线
的距离相等的点的轨迹是抛物线;
正确的命题是_________ .
①已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2ba05abdc8179e5ff980fb2d15ce2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71dfa562fe8529f0f92673c2864d3c5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e60f7f44e7986a067b75c53faa438f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
③两个随机变量的线性相关性越强,则相关系数的绝对值就越接近于1;
④在平面直角坐标系内,到点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c832f2474efe89961ef41e884da7660c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff16f02559e1312c183861c5526e560.png)
正确的命题是
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【推荐2】下列说法中所有正确的序号是_________
①两直线的倾斜角相等,则斜率必相等;
②若动点
到定点
和定直线
的距离相等,则动点
的轨迹是抛物线;
③已知
、
是椭圆
的两个焦点,过点
的直线与椭圆交于
、
两点,则
的周长为
;
④曲线的参数方程为
为参数
,则它表示双曲线且渐近线方程为
;
⑤已知正方形
,则以
、
为焦点,且过
、
两点的椭圆的离心率为
.
①两直线的倾斜角相等,则斜率必相等;
②若动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764551064af30b542042b5e501e7e57d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
③已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890dbab94a66ceb9a45477e9675d1b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5e56b5cbcf69756792fc934bcc20cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
④曲线的参数方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72153c7bba827ea1849d47fd9c2091cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dec7f6309562276a49560c17c98dedf.png)
⑤已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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