1 . cos(-225°)=______ .
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2卷引用:陕西省汉中市2021-2022学年高三上学期第一次校际联考理科数学试题
2 . 已知两个单位向量
,
的夹角为
,则下列结论不正确 的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/798a8e195c8451c5e19da9084fb702ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c3a5188e9174dd76ca30e6648dcbf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
A.![]() ![]() ![]() | B.![]() |
C.![]() ![]() | D.![]() ![]() |
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2019-06-29更新
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2卷引用:陕西省汉中市2019届高三全真模拟考试数学(文)试题
3 . 已知
且
,则下列等式恒成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e23d8ac05ff7e3ea5a5669fa074b097.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 已知
,则下列各角中与角
终边相同的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c1c6b80e87a3ae313c1539aacbae5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2卷引用:陕西省汉中市西乡县2019-2020学年高一下学期期末模拟数学试题2
20-21高一下·全国·课后作业
5 . 设
,
分别是与
,
同向的单位向量,则下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d7489069a3e8897edf05ecbc4f980a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecce88bab6650e0551b2a49d4651672d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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6 . 已知扇形的圆心角为
,半径为
,则该扇形的弧长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
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2020-08-16更新
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2卷引用:陕西省汉中市2019-2020学年高一下学期期中数学试题
7 . 已知向量
若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9919e2106c72cd947ba25e8b80b922f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98c70e0aeb2c6eb0cd4bd7387f8965e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3031e711f9969fad2e4e2dfac8518717.png)
A.![]() | B.![]() | C.2 | D.![]() |
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3卷引用:陕西省汉中市龙岗学校2019-2020学年高二上学期期末考试数学(文)试题
8 . 已知
,
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e4d2bcf4cdaab2a07ddf3640bb7ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e46b033225d9a5e4d39174997ff0f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe7721349fa4bdf9efe4c8e89166588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f667b3e6f59faffdea8613b5372bafe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e1262dad903054abae2f37fd80729d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e4d2bcf4cdaab2a07ddf3640bb7ffa.png)
A.2 | B.![]() | C.![]() | D.5 |
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3卷引用:陕西省汉中市2018-2019学年高二下学期期末校际联考数学(理)试题
解题方法
9 . 如图,
是圆
的直径,点
是半圆弧的两个三等分点,
,
,则
( )
![](https://img.xkw.com/dksih/QBM/2020/3/1/2410295828226048/2411782686466048/STEM/b24520b3-5ed9-4f49-8458-d618138c2d07.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/8c29a7e8eea08197bf53164a560bee58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e69148daeb9cc63a07b1018f7107c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b54aa2b7f9adf409f0ce8e00615432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b67dbd1e5f9e516a7d2db00ff8dd5268.png)
![](https://img.xkw.com/dksih/QBM/2020/3/1/2410295828226048/2411782686466048/STEM/b24520b3-5ed9-4f49-8458-d618138c2d07.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 已知函数
,
,且
在
上单调递减,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9448bf1d6136b3a108e7ea60506ad39.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e83874896c4b3fbe30c5233ca57d38c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d739bf299b1018a0e73d5cdc5b8810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc299018cae8bc47faa38c156b355ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9448bf1d6136b3a108e7ea60506ad39.png)
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7卷引用:陕西省汉中市2022届高三下学期教学质量第二次检测考试文科数学试题