题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054044-90119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-48798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-22649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-48798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-22649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-26396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-69873.png)
A.1 | B.![]() | C.2 | D.![]() |
答案
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-26396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-69873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054046-39483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054047-60047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054047-28078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054047-92338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054047-75382.png)
又△OAB是以O为直角,所以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054048-29181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054047-75382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054048-76920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054048-10381.png)
△OAB的面积
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054048-76973.png)
点评:典型题,从
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054046-39483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054047-28078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054048-76973.png)
核心考点
试题【已知=(cos, sin), , ,若△OAB是以O为直角顶点的等腰直角三角形,则△OAB的面积等于( )A.1B.C.2D.】;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/20191104/20191104054036-62348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054037-85861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054037-30743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054037-59797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054038-95290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054038-32445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054038-12046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054038-43872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054039-68491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054039-27792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054037-59797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054039-78374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054039-19636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054031-24250.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054022-62612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054022-11405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054022-16735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054022-87280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054023-69923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054023-50184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054023-90438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054023-57645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054024-20161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054024-40470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054013-29699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054013-20348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054014-24154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054014-91703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054014-49671.png)
A.2 | B.1 | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054005-20870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054005-53480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054006-58614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054006-51765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054005-20870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054006-15560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054006-94390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054006-97318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054007-34084.png)
A.![]() | B.![]() | C.![]() | D.![]() |
最新试题
- 1一个与自然数有关的命题,若n=k(k∈N)时命题成立可以推出n=k+1时命题也成立.现已知n=10时该命题不成立,那么下
- 2阅读下面作品,完成下面问题。醉太行 ①在我过去的认知里,太行山有雄无秀,虽然有直立的万丈悬崖,但一个个山头犹如和尚的秃
- 3After the Asian Games, ______ people came to Guangzhou for a
- 4下列物质中不能与NaOH溶液反应的是( )A.FeB.AlC.Al(OH)3D.CuCl2溶液
- 5As we know, nothing can be equal to the ______ of parents fo
- 6下述仪器或装置没有使用到传感器的有 ( )A.自动报警器 B.弹簧测力计 C.电视遥控器 D.红外线探测仪
- 7The result of the study was published last week in New York,
- 8化简:2x-21-x2=______; 4m2-3mnmn-3m2+2mnnm=______.
- 9读句画图并填空:如图,点P是∠AOB外一点,根据下列语句画图(1)过点P,作线段PC⊥OB,垂足为C.(2)过点P,向右
- 10若(ax+3y)2=4x2-12xy+by2,则a、b的值分别为
热门考点
- 1I take the train to work every morning from a train station
- 2对自行车运动员甲、乙两人在相同条件下进行了6次测试,测得他们的最大速度(m/s)的数据如下:试判断选谁参加该项重大比赛更
- 31970年,美国的玉米由于受到一种叶菌的危害而严重减产。后在墨西哥发现了对这种病菌有抗性的植物,从而为改良玉米品种找到了
- 4胚胎工程的目的是[ ]A.获得蛋白质B.获得改造后的基因C.定向控制、改造和创造新遗传性状D.获得大量细胞
- 5透镜一般分为两类:中间厚边缘薄的透镜叫______,它对光线有_____作用,所以又叫__________.中间薄边缘厚
- 62011年投资理财市场可谓冰火两重天:一边是银行理财产品的火爆;一边是股市楼市的跌跌不休。再加上通胀因素,2011年对很
- 7男运动员6名,女运动员4名,其中男女队长各1名,选派5人外出比赛,在下列情形中各有多少种选派方法?(1)男运动员3名,女
- 8某气态烷烃20mL,完全燃烧,正好消耗同温同压下的氧气100 mL,该烃的化学式是[ ]A.C2H6B.C3H8
- 9若a的相反数是7,则a的倒数是( )A.7B.-17C.17D.±17
- 10在化学实验室,小刚和小强意外发现实验桌上有一瓶敞口放置的氢氧化钠固体,他们对这瓶氢氧化钠固体是否变质进行了如下实验探究: