题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015548-32336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015549-64977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015549-67037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015549-82247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015549-49649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015550-48819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015550-44775.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015550-80967.png)
解析
∴存在实数λ,使得 AB =λ BD ;
∵ BD =" CD" - CB ="2" e1 - e2 -( e1 +3 e2)= e1 -4 e2,
∴2 e1 +k e2 =λ( e1 -4 e2),
∵ e 1, e 2是平面内不共线的两向量,
∴ 2=λ k=-4λ 解得k=-8.
故答案为:-8
核心考点
试题【设与是两个不共线的向量,已知,,,则当三点共线时, . 】;主要考察你对平面向量的基本定理及坐标表示等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015542-73243.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015543-34740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015543-64075.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015543-64075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015543-69691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015543-47656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015535-39854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015535-57570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015536-91292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015536-41499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015535-39854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015535-57570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015536-99368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-63139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-92517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-50649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-28149.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-63139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-76287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-50649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-14329.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-63050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-52375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-53391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015519-40590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015519-95684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015519-64687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015519-40233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015520-82033.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-99232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-87631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-86598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-87631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-52006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-34233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015514-88171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015514-33722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015514-92284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-87631.png)
A.点![]() ![]() | B.点![]() ![]() |
C.点![]() ![]() | D.点![]() ![]() |
最新试题
- 1下列句中加点的成语,不能用句后括号中的熟语替换的一项是 A.情况十分紧急,险情就是命令,李刚当机立断,顾不上向上级汇报,
- 2在漫长的地质历史演变过程中,最晚出现的是[ ]A.种子蕨B.类人猿C.人类D.被子植物
- 3The flu is believed _____ by viruses that like to reproduce
- 4____ the tower building,where you see the whole city.[
- 5看电视时,调节音量是为了改变声音的( )A.响度B.音调C.音色D.频率
- 6Much to my _______,I am unable to accept your invitation.A.f
- 7下图是初中化学中某些常见化合物的转化关系图其中X是一种重要的建筑材料,A不支持燃烧可用于灭火,B与水反应放出大量热请根据
- 8概括下面一段文字中反映的主要现象及其原因。(不超过30个字)(4分)美国耶鲁大学,在过去的25年里,历史一直是头号热门专
- 9《中华人民共和国环境保护法》1983年问世。 ( )
- 10下列句子中标点符号使用有误的一项是A.观众长时间地等待,只为了一睹她的风采、或签上一个名。B.为了子孙后代,为了中华民族
热门考点
- 1写出下列化学用语中的2所表示的意义。(1)2H2O____________________(2)____________
- 21954年,第一届全国人民代表大会制定了[ ]A.《中华民国约法》B.《中国人民政治协商会议共同纲领》C.《中华
- 3水是生命的源泉,也是不可缺少的资源.(1)下列物质中属于纯净物的是(填字母)______.A.汽水B.蒸馏水C.矿泉水D
- 4如图所示,两平行导轨与水平面成θ角倾斜放置,电源、电阻、金属细杆及导轨组成闭合回路,细杆与导轨间的摩擦不计.整个装置分别
- 5关于我国临海和领海的叙述正确的是 ( )A.渤海和琼州海峡属我国内海 B.我国领海宽度为12千米C.台湾
- 6如图所示,A、B、C为电场中同一电场线上的三点,设电荷在电场中只受电场力作用,则下列说法正确的是( )A.若在C点
- 7对中国资本主义工业兴起的叙述,不正确的是 [ ]A、受外商企业的刺激 B、
- 81894年孙中山在檀香山组织的革命团体是[ ]A.同盟会B.兴中会C.强学会D.保国会
- 9新中国成立60年来,我国社会经济的发展发生了翻天覆地的变化,先后经历了农业经济、工业经济、信息经济时代,有专家说我国经济
- 10***在中共七届二中全会报告中指出:“在革命胜利以后一个相当长的时期内,还需要尽可能地利用城乡私人资本主义的积极性,以利