已知
,
,
,设
,
,
.
(1)判断
的形状;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cceb595f1a2a9d1affa28eb40224b425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43afb1efd948342560d0ead9bd13b68a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c865f470fe02a1cd5cccc72b8257f3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23adb3fa3a098da1a12ed22472d0697c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7894a1a495d4fa4d7959d94a97dabc55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56102893dd74583c1ad8342da46011b5.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce4f642d314962a5e542ef14bc89cd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
更新时间:2023-12-20 13:42:25
|
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解答题-问答题
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适中
(0.65)
【推荐2】给定空间三个点
、
、
.
(1)求以向量
、
为一组邻边的平行四边形的面积S;
(2)求与向量
、
都垂直的单位向量
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b41e39d45f00bf73eea975786230e0.png)
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(1)求以向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b680f91c4a693cc9ab2c23f2e9114ce.png)
(2)求与向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b680f91c4a693cc9ab2c23f2e9114ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】已知空间三点
,设
.
(1)若A,B,C三点共线时,求t的值;
(2)若
时,当向量
与
互相垂直,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f835e1a0cc02481d42765c09d71e3c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d3feeb5535cbe287df567a65a091d8.png)
(1)若A,B,C三点共线时,求t的值;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6135527842e3c0719dfa306a107ae8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d42dc4df563f20b929b98477b614ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb2a83c6efb22d355ff2d9789b0507d.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知空间向量
.
(1)若
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,求
的坐标;
(2)若
,且
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a2786e854820f9478c7e87b91691f2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d2cd576db6f49273ae6c59f3652cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a3e7ae218ab85b4f12f90ee090676cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d812643e080d4d447fab7fe2ae2646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019d4ad2e3fb4a7abb66e0e9e55b556.png)
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解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐3】类似平面解析几何中的曲线与方程,在空间直角坐标系中,可以定义曲面(含平面)
的方程,若曲面
和三元方程
之间满足:①曲面
上任意一点的坐标均为三元方程
的解;②以三元方程
的任意解
为坐标的点均在曲面
上,则称曲面
的方程为
,方程
的曲面为
.已知曲面
的方程为
.
过曲面
上一点
,以
为方向向量,求证:直线
在曲面
上(即
上任意一点均在曲面
上);
(2)已知曲面
可视为平面
中某双曲线的一支绕
轴旋转一周所得的旋转面;同时,过曲面
上任意一点,有且仅有两条直线,使得它们均在曲面
上.设直线
在曲面
上,且过点
,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1277d620abbfa26fb39600e53e606d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1277d620abbfa26fb39600e53e606d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1277d620abbfa26fb39600e53e606d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa13f27f92b55bd7ecd9d750f98ae99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1277d620abbfa26fb39600e53e606d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1277d620abbfa26fb39600e53e606d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eedd047376c4cf1b9992cd8e4fe20df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b4e60b50889c152c56fcf2d6ea35bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知曲面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d96461d2b3421aed548b754637ca8a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ddad9072eb1393ce15ca0627c941b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
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