1 . 如图,
是平面
的斜线段,点
为斜足,若点
在平面
内运动,使得
的面积为定值,则动点
的轨迹的形状是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/7027f7df-3003-4fa6-97ae-a5993bc02b12.png?resizew=178)
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解题方法
2 . 如图,在底面边长为2,侧棱长为6的正三棱柱
中,一细绳自点
绕正三棱柱的侧面一周后到达点
,绳子拉紧后与侧棱
分别交于点
,此时绳子最短.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/405653d3-9d89-4872-8e00-baa42adb1caa.png?resizew=123)
(1)求异面直线
与
所成的角
的余弦值;
(2)求异面直线
与
间的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44a301aebbc51f73a2ff668198265b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/405653d3-9d89-4872-8e00-baa42adb1caa.png?resizew=123)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/443a82723ae5cf11aa917362e7db003f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/443a82723ae5cf11aa917362e7db003f.png)
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3 . 已知三棱锥的各顶点都在以O为球心的球面上,且
,
,
两两垂直,若
,则球心O到平面
的距离为( ).
A.![]() | B.![]() | C.1 | D.![]() |
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解题方法
4 . 空间四面体ABCD中,已知
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/665746bf-ebef-4fac-b425-6dbef3721475.png?resizew=161)
(1)求CD的长;
(2)已知点E在线段AC上运动,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b134e7a79f6b0ccd857d2ed852098e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa6874ed1ac4e8ebf7f341e3e3056cfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b36f544cf07db2aeecbe76e87a8c555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/665746bf-ebef-4fac-b425-6dbef3721475.png?resizew=161)
(1)求CD的长;
(2)已知点E在线段AC上运动,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae7c0b22a09146fe87955159f70454b.png)
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5 . 棱长为2的正四面体
在空间直角坐标系中移动,但保持点A,B分别在x轴,y轴上移动,则原点
到直线CD的最近距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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6 . 二次函数的图像如图所示,点
位于坐标原点,
,
,
,…,
,…在
轴的正半轴上,
,
,
,…,
,…在二次函数
第一象限的图像上,若
,
,
,…,
,…都是正三角形.
(1)求三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b174ae2f485f90e14ec63c48316cdf8.png)
(2)设三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3609a74b3d10d869892e537a63b151.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29d5bc641820d9248491e90b2ba58c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d136863d6beae5098ba2150334ddf235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解题方法
7 . 点在圆
上移动,点
在椭圆
上移动,则线段
的最大值为
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8 . 已知,
为实数,代数式
的最小值是
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9 . 随机变量
,当
取最大值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080efd4919712153e1075e09646570ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea418a8b8eea468c5fa3422c9669705.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
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解题方法
10 . 已知抛物线
经过椭圆
的两个焦点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/90a3be1e-8525-415e-82af-b72b7b9c0cda.png?resizew=173)
(1)求椭圆
的离心率;
(2)设
,又点
为
与
不在
轴上的两个交点,若
的重心在抛物线
上,求
和
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ee03b5f5c40c4a64e15bd90673783e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2cfc8743c915f45bdccca70ab16648.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/90a3be1e-8525-415e-82af-b72b7b9c0cda.png?resizew=173)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208f32acf0666fcc867c56e41e0e7562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0023c9e8e0fec24d3aa77d09b2e4e62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
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