题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053547-17063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053547-86721.png)
(2)(5分)在矩形ABCD中,边AB、AD的长分别为2、1,若M、N分别是边BC、CD上的点,且满足
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053547-55030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053548-10169.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053548-30080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053548-47020.png)
解析
试题分析:(1)根据题意可知圆滚动了2单位个弧长,点P旋转了
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053549-19055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053549-15137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053549-17705.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053548-30080.png)
(2)如图所示,以
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053549-98613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053550-36365.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053550-33034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053550-94712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053550-40860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053551-22660.jpg)
∵在矩形
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053551-87571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053551-72089.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053551-54956.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053552-88822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053552-12653.png)
∴由
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053552-21710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053552-13908.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053553-25122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053553-53605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053553-72453.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053553-13651.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053554-43674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053554-35619.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053554-66271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053548-47020.png)
点评:向量的坐标就是终点的坐标减去起点的坐标。做第一问的关键是弄清点P转了多少弧度。
核心考点
试题【)(如图,在平面直角坐标系xOy中,一单位圆的圆心的初始位置在(0, 1),此时圆上一点P的位置在(0, 0),圆在x轴上沿正向滚动。当圆滚动到圆心位于(2, 】;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
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053538-86468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053539-79812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053539-53958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053539-63625.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053539-67421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053540-92982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053540-35891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053540-49344.png)
A.1 | B.2 | C.3 | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053525-98701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053520-74851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053520-87397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053520-41717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053520-38835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053521-16217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053521-66903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053514-80893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053514-48959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053515-96737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053515-23508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053515-28322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053515-46720.png)
A.以AB为底边的等腰三角形 | B.以BC为底边的等腰三角形 |
C.以AB为斜边的直角三角形 | D.以BC为斜边的直角三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053509-31227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053509-25328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104053509-96098.png)
最新试题
- 1At a rough estimate .Nigeria is Great Britain.A.th
- 2提出“保天下者,匹夫之贱与有责焉耳矣”的思想家是( )A.顾炎武B.黄宗羲C.王夫之D.李贽
- 3【题文】将下面划横线的三个分句压缩到10字以内,填写在空格处。压缩后的句子需句式一致并保留原意。①当别人为你做什么时,你
- 4下列各选项中各类物质依次表示为X、Y、Z,与图三个圆所示的从属关系不相符( )A.置换反应、氧化还原反应、化学反应B.
- 5把经过高温消毒的花生种子放在空气充足和温度适宜的环境中,种子也不会萌发,最可能的原因是( )A.胚不完整B.缺少营养物
- 6欲将pH等于5的盐酸变成pH等于7的溶液,可以选用下列物质中的( )A.盐酸B.水C.氢氧化钠D.氯化钠
- 7实验题。 张晨和几个同学到海边去野餐,他们带上了锅、盆、火柴、干净的毛巾等炊具,但是忘记了带淡水,附近又找不到水源
- 8某物质不含碳元素和氢元素,它不可能是( )①酸 ②碱 ③盐 ④有机物中的.A.①②④B.②③④C.①②③D
- 9(3分)为了测定某纯碱样品中碳酸钠的质量分数(杂质是氯化钠),将20g的该样品溶解在90g水中,加入适量溶质质量分数为1
- 10航天英雄费俊龙,从小就热爱科学,在上小学、初中期间,一直刻苦努力,成绩名列前茅。说明他[ ]①珍惜受教育权利②自
热门考点
- 1如图所示,厦门至上海的动车铁路线里程约为1127km,厦门与上海两地的直线距离约为813km。小明从厦门乘动车到达上海时
- 2有一充电的平行板电容器,两板间电压为9V,现使它的电荷量减少6×10-4 C,于是电容器两极板间电压降为原来的1/3,此
- 3在我国,行使________是公民参与管理国家和管理社会的基础和标志。[ ]A、监督权B、政治自由C、维护国家安
- 4如图:a∥b,图中的∠1,∠2,∠3,∠4,∠5,∠6,∠7 中同位角有______对.
- 5小敏来到实验室完成氧气和二氧化碳气体的制取实验,请按照要求答问题:①实验台前有如图甲仪器和药品,请写出仪器A、B的名称:
- 6满足条件的复数在复平面上对应点的轨迹是( ).A.一条直线B.两条直线C.圆D.椭圆
- 7Li Lei often ____ Lin Tao ____ his English.A.help; toB.helps
- 8阅读下面这首唐诗,然后回答问题。流 莺李商隐流莺漂荡复参差,度陌临流不自持。巧啭岂能无本意,良辰未必有佳期。风朝露夜阴晴
- 9读图完成下列问题。 (9分) (1)填出图中序号所代表的地理事物名称: 山脉:①________________②_
- 10小明在街上看到一辆牌照为“鄂A06356”的汽车,据此判断该车的发牌省级行政区应是A.湖南B.江西C.广东D.湖北