题目
题型:不详难度:来源:
在
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081935-23050.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081935-60377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081935-30728.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081935-51847.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081936-59718.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081936-88397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081936-54467.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081936-10075.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081937-38083.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081937-66348.gif)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081935-60377.gif)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081937-91814.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081937-43675.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081936-88397.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081937-85873.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081938-83879.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081937-66348.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081938-32464.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081938-83881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081938-23361.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081939-27214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081939-15957.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081939-25584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081937-85873.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081939-31756.gif)
(Ⅱ)由
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081937-43675.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081940-61838.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081940-27704.gif)
依正弦定理,得
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081940-44787.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081940-80684.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081940-46761.gif)
解得,
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081938-83879.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081941-99388.gif)
核心考点
试题【(本小题满分12分)在中,角,,所对的边分别为,,,向量,,且.(Ⅰ)求角的大小;(Ⅱ)若,,求的值.】;主要考察你对平面向量数量积的意义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081929-31463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081930-56484.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081930-40718.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081930-21195.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081930-29878.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081931-76444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081929-31463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081931-76444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081931-76444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081931-82801.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081930-29878.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081922-86154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081923-60711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081923-42216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081923-42216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081923-52522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081923-86934.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081917-91832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081917-74878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081917-18105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081917-14089.png)
A.最大值为8 | B.是定值6 | C.最小值2 | D.与![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081910-11387.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081910-47614.gif)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081910-59592.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081910-54890.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081911-58942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081911-92134.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081904-75721.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081904-71192.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081904-15019.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081905-49621.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081905-65423.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104081905-16743.gif)
最新试题
- 1 ——Can you tell me why________? ——Because I want to help
- 2能自身发光的物体叫做光源,下列物体属于光源的是( )A.商品柜内的蜡烛B.夜间闪亮的萤火虫C.月亮D.房屋
- 3—Didn"t you finish your homework last night?—_______, though
- 4每当取得好成绩时,韩红的妈妈总是说这是大家共同努力的结果,而韩红则总是强调这主要是自己努力的结果。由此可见,韩红与她母亲
- 5---There is a tall building on Taoze Road. Do you know?---I
- 6下列历史故事不是产生于春秋战国的是[ ]A.指鹿为马B.问鼎中原C.围魏救赵D.朝秦暮楚
- 7在等差数列中,,.令,数列的前项和为.(1)求数列的通项公式和;(2)是否存在正整数,(),使得,,成等比数列?若存在,
- 8已知定义在R上函数f(x)是奇函数,对x∈R都有,则f(2012)=[ ]A.2
- 9我国的裸子植物在世界上是最丰富的,因此我国被称为_______ 。其中_______素有“植物中的熊猫”之称。
- 10某批发市场批发甲、乙两种水果,甲种水果的销售利润(万元)与进货量(吨)近似满足函数关系;乙种水果的销售利润(万元)与进货
热门考点
- 1阅读《唐雎不辱使命》选段,完成问题。 秦王谓唐雎曰:“寡人欲以五百里之地易安陵,安陵君不听寡人,何也?且秦灭韩亡魏,而
- 2We know the famous ones—the Thomas Edisons and the Alexander
- 3如下图,分别以直角三角形三边为直径,向外作三个半圆,并将其涂上颜色,观察其形状.
- 4I"m sure that stricter roles to control cigarette smoking
- 5“革命是历史的火车头”。英国资产阶级革命和美国独立战争的共同作用是:A.实现了民族独立B.建立了君主立宪政体C.使民主共
- 6某实验小组要描绘一只规格为“2.5V 0.5A”小灯泡的伏安特性曲线, 除了提供导线和开关外,还有以下一些器材: A.电
- 7﹣2的相反数是( ),倒数是( ).
- 8“十一”黄金周期间,东仔同学在珠海街头看到某旅行团乘坐的一辆车牌号为“湘A57681”的旅游大巴车,据此决断下列说法可能
- 9I worked in a foreign company for five years. Still, I don’t
- 10将新鲜的蔬菜、水果放在冰箱内冷藏可以保鲜,其主要原因是冷藏条件下 [ ]A.呼吸作用减弱