名校
1 . 在三角形
,已知
,
.
(Ⅰ)求
.
(Ⅱ)已知
与
成钝角,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3eb3b106e57dea32fd594e16a1e6bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc383f895b2cf5a0a0cae80fd331c30f.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e6508e26d0a1315131dfed21d8bb5a.png)
(Ⅱ)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b68a4d6f52160faeb7b7c9f403c9fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf4f5fd1c786a30e861700602fe4d4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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13-14高一下·浙江湖州·期中
解题方法
2 . 已知a=(2,-1), b=(
,3).若a与b的夹角为钝角,则
的取值范围是________
![](https://img.xkw.com/dksih/QBM/2014/6/17/1571779340550144/1571779346194432/STEM/e492ff33d5514625a72cc4da3781c4d0.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2014/6/17/1571779340550144/1571779346194432/STEM/e492ff33d5514625a72cc4da3781c4d0.png?resizew=17)
您最近一年使用:0次
2019-01-30更新
|
1012次组卷
|
3卷引用:2013-2014学年浙江省湖州市属九校高一下学期期中考试数学试卷
名校
解题方法
3 . 设
是
的外心(三角形外接圆的圆心).若
,则
的度数等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf09a57c67f3ac18a94bf82bb1c0820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-03-23更新
|
333次组卷
|
3卷引用:江西省南昌市2018届高三第一轮复习训练题数学(六)《平面向量与解三角形》
江西省南昌市2018届高三第一轮复习训练题数学(六)《平面向量与解三角形》(已下线)《2018届优生-百日闯关系列》数学专题 一 第五关 以向量与解析几何、三角形等相结合为背景的选择题内蒙古赤峰市赤峰二中2024届高三上学期第四次月考数学(文)试题
2016高一·全国·课后作业
4 . 已知O为△ABC的外心,若
,则
=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105a1992dc99a98d54302f694ce9ae03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
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5 . 在直角坐标平面xOy内,已知向量
,
,点
为满足
的动点,当
取得最小值时,求:
(1)向量
的坐标;(2)
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf3f64cc9acfba4d03a72879c3ab843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d8d54d30bc459cdd6fd6d180decd325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19344396549c21f5a8be6de27838ce46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26745c68adee56a643ef5054206968a2.png)
(1)向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec64476aaca08de0808afda3618109c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35031ade086c0cb5adcd82aaef62462.png)
您最近一年使用:0次
2017-06-23更新
|
840次组卷
|
2卷引用:江苏省苏州市2016-2017学年高一下学期期末备考试题分类汇编:平面向量中的最值问题探究数学试题
6 . 已知下列命题:①若
<0,则
与
的夹角为钝角;②a,b∈C,则“ab∈R”是“a,b互为共轭复数”的必要非充分条件;③一个骰子连续投2次,点数和为4的概率为
;④若n为正奇数,则6n+
+
+…+
被8除的余数是5,其中正确的序号是 .
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560152297472/1572560157835264/STEM/4ad45428828d4e08b9a688bdcf4c087e.png?resizew=30)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560152297472/1572560157835264/STEM/42a22b0572a3469aaf8a00dcade80830.png?resizew=10)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560152297472/1572560157835264/STEM/86f58b7b788f461896756637bbeeaf5e.png?resizew=10)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560152297472/1572560157835264/STEM/452566e28f734440bab28d450a130ae7.png?resizew=10)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560152297472/1572560157835264/STEM/919007a173c74efcb78fbabc27b756f4.png?resizew=56)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560152297472/1572560157835264/STEM/a86f4f2d0c3643649d06007a594049dc.png?resizew=56)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560152297472/1572560157835264/STEM/a9aeb48a3db741e99f9a1dd02b11783b.png?resizew=72)
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7 . 直线
与
的夹角的大小为 .(结果用反三角函数表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd6e61ebaedc137b5ed242f84c6f5d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c1180bef2dcf7a01380c1185519067.png)
您最近一年使用:0次
8 . 设
且
与
的夹角为锐角,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e80d4942743ed691fdca493aa505bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afae9db82464afb37d387f6cbedc8139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2016-12-01更新
|
371次组卷
|
3卷引用:2014-2015学年甘肃省高台县第一中学高一下学期期末考试数学试卷
2014·上海奉贤·二模
名校
9 . 三角形
中,设
,若
,则三角形
的形状是
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551030784/STEM/fcdf6024387a4bda9701e4a6efccf083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/043f47fb975f6044f94d2de2fa261c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c07cf7d2fa8617ddba8283102dc9bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551030784/STEM/fcdf6024387a4bda9701e4a6efccf083.png)
A.锐角三角形 | B.钝角三角形 | C.直角三角形 | D.无法确定 |
您最近一年使用:0次