名校
1 . 已知
,
,
,
,直线
.
(1)求直线AB与直线l夹角的余弦值;
(2)若
为锐角,求t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c928a84ae85ae403a181802337c5e145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466e8c438084aef563c6aaeff3bca583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13444c3f459dc56ffab2639bdee54170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483b8d9c1b6be9a684bc1b835df88955.png)
(1)求直线AB与直线l夹角的余弦值;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b18ee599d9e222f6893fe40a1b4406a.png)
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2021·全国·模拟预测
名校
2 . 回旋镖(Boomerang)曾是澳大利亚土著人的传统狩猎工具,今在澳大利亚回旋镖是相当受欢迎的运动项目.四叶回旋镖可看作是由如图所示的四个相同的直角梯形围成,其中
,若点H满足
,则向量
与
的夹角为( )
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883681809309696/2883718543384576/STEM/5319f136a58240b49b60bfdcf08160b8.png?resizew=227)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a204736186742e998dd00acff244a3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d6b123c64d8dee6dc51dbc0d10d3194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2cf03ac7a1b0aba75daa3b9f9b5768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63792f382d8549f9338521db40d35400.png)
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883681809309696/2883718543384576/STEM/5319f136a58240b49b60bfdcf08160b8.png?resizew=227)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 下列命题中错误的是( )
A.空间中任意两个非零向量![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.直线的方向向量是唯一确定的 |
D.若![]() ![]() |
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解题方法
4 . 质点O受到两个力
和
的作用,合力为
.已知
N,
N,
和
的夹角为60°,求
及
与
的夹角大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cfc4a3092521f83e4b9c16dccd4eb72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea7504f12e6a604988a905aba10930a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3b81b741fc5c4f680299b5724502e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/974ebdc077bc91318d83977aa6c52ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c7ce913d31d051ec021e1cb52632ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cfc4a3092521f83e4b9c16dccd4eb72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3b81b741fc5c4f680299b5724502e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55c2d98c28982e7ccbe69147f5f8647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03648603cafd0fc5b3175f0529379013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3b81b741fc5c4f680299b5724502e5.png)
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解题方法
5 . 如图,在直角坐标系中,
,
,点
在
轴上且
,则下列说法正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/e3cddd8b-7dab-41d9-a2e9-1c48234f3968.png?resizew=256)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbabeab7e7d0e4bcd21a188362b5b9f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08662f30e41613416a23327c4de6099b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf0edea792798049cd728af69f74e19.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/e3cddd8b-7dab-41d9-a2e9-1c48234f3968.png?resizew=256)
A.![]() |
B.![]() |
C.与![]() ![]() ![]() |
D.![]() ![]() ![]() |
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解题方法
6 . 如图所示是两个半径不同的同心圆,半径分别为1和
是小圆
上的一个动点,
是大圆
上的三个不同的动点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7231c8dd7928b46f06a4286903c47363.png)
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715469668352000/2799679180554240/STEM/60ad64d120bf444cb1732c9242531b77.png?resizew=165)
(1)求证![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bbe8a224c56e320004764101b9871f.png)
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2353c7e8ad00d9d25c71535bd45d7568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28855a0db693584aabac1df99dfade3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7231c8dd7928b46f06a4286903c47363.png)
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715469668352000/2799679180554240/STEM/60ad64d120bf444cb1732c9242531b77.png?resizew=165)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bbe8a224c56e320004764101b9871f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219924df5ba319fe45e8356621730fe5.png)
您最近一年使用:0次
名校
解题方法
7 . 以下是真命题的是( )
A.已知![]() ![]() ![]() ![]() ![]() |
B.已知![]() ![]() ![]() ![]() ![]() |
C.在三角形![]() ![]() ![]() |
D.若三棱锥的三条侧棱与底面所成的角相等,则顶点在底面的射影是底面三角形的外心 |
您最近一年使用:0次
2021-08-12更新
|
700次组卷
|
3卷引用:广东省(惠州一中、汕头金山中学、深圳实验学校、珠海一中)四校2020-2021学年高一下学期期中联考数学试题