1 . 已知
=(4,2),
=(6,y),且
⊥
,则y的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
A.﹣12 | B.﹣3 | C.3 | D.12 |
您最近一年使用:0次
2 . 已知向量
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84321d37ec168d51bdc810a007845c38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967ca5a769bd8010f1651ccc34c24151.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84321d37ec168d51bdc810a007845c38.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
3 . 已知向量
,
,若向量
,则实数的
值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd75c5badf3e60d9e462fa652f5c0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f64e149f8270803cef3b9f05039dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 .
的外接圆圆心为
,半径为
,
,且
,则
在
方向上的投影为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129d17c9a49272d44a0e70346414d12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca069274eb90c5c036f0b215943afe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c345e85e30b81df70acadce29364a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1456c843b61c0f8cd311dfa261038860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e835b67425fbe36669c66a13025c6b67.png)
A.1 | B.2 | C.![]() | D.3 |
您最近一年使用:0次
5 . 在△
中,角
为钝角,
,
为
边上的高,已知![](https://img.xkw.com/dksih/QBM/2015/10/10/1572255942197248/1572255948062720/STEM/f8d6a59e68ff4059a3c6233f815dae44.png)
,则
的取值范围为
![](https://img.xkw.com/dksih/QBM/2015/10/10/1572255942197248/1572255948062720/STEM/4dcd6086c5fa4ae399ca71a3c413aae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2015/10/10/1572255942197248/1572255948062720/STEM/81f653a208e64f549e33c5864c11aa09.png)
![](https://img.xkw.com/dksih/QBM/2015/10/10/1572255942197248/1572255948062720/STEM/9e37c9b9747749ce9977ac67cf854340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2015/10/10/1572255942197248/1572255948062720/STEM/f8d6a59e68ff4059a3c6233f815dae44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24c1d65d2729b744fadc425712385af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 已知向量
与向量
平行,则锐角
等于
![](https://img.xkw.com/dksih/QBM/2015/6/26/1572149789515776/1572149795020800/STEM/14469354841b44d3adfae1a2a4920a4e.png)
![](https://img.xkw.com/dksih/QBM/2015/6/26/1572149789515776/1572149795020800/STEM/3e3593dd6072475bba56c1a13e9833e5.png)
![](https://img.xkw.com/dksih/QBM/2015/6/26/1572149789515776/1572149795020800/STEM/06db917ec85142e79995a54ef4868a76.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2015-06-23更新
|
114次组卷
|
3卷引用:2014-2015学年浙江省绍兴市一中高二下学期期中考试理科数学试卷
11-12高二下·湖北武汉·期末
7 . 已知
,
,
为坐标原点,点
在第四象限内,且
,设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2781008a3859105f18a39003228602e9.png)
,则
的值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3c9cc823b331f0c211c1541d9bdb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8917dc13ed1b7999dba24a59b35e0de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2781008a3859105f18a39003228602e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fd4d8112539e1a2332ecd72bdab0b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.2 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
12-13高一上·黑龙江大庆·期末
名校
8 . △ABC中,
·
<0,
·
<0,则该三角形为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18eecc9135b568c133d8bebe6d18839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431c8b143595051d9465017a26060b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431c8b143595051d9465017a26060b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01adf0d0159e98cb1046f5aef71798fd.png)
A.锐角三角形 | B.直角三角形 | C.钝角三角形 | D.不能确定 |
您最近一年使用:0次
2012-03-19更新
|
811次组卷
|
3卷引用:2011-2012学年黑龙江省大庆铁人中学高一上学期期末考试数学试卷
(已下线)2011-2012学年黑龙江省大庆铁人中学高一上学期期末考试数学试卷山东省济宁市第二中学2019-2020学年高一下学期第一次线上检测(实验班)数学试题广东省揭阳市惠来县第一中学2022-2023学年高二上学期期中数学试题