题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-32735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-96944.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-32735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-96944.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-32735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-96944.gif)
若|
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-32735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-96944.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-32735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-96944.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-32735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-96944.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064948-78457.gif)
解析
核心考点
试题【定义: |×|=||·||·sinθ,其中θ为向量与的夹角,若||="2," || ="3," ·=-4,则|×|=___________】;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
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064936-98498.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064936-32208.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064937-75901.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064937-20335.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064937-98455.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064938-67127.gif)
(3)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064937-20335.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064937-98455.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064938-67127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064932-69214.png)
A.-18 | B.18 | C.0 | D.12 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064924-67033.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064924-98339.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064924-67033.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064925-67398.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064925-63523.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064919-63206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064919-60961.png)
A.![]() | B.![]() | C.6 | D.12 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064914-81704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064914-25489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064914-52489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104064915-58221.png)
A.![]() | B.![]() | C.![]() | D.以上均不对 |
最新试题
- 1识读下图,回答问题。(1)上图所示为[ ]A.六朝古都南京B.唐朝都城长安C.元朝都城大都D.明朝都城北京(2)
- 2请根据下面表格提示,以“Australia”为题,用5个句子写一篇简述澳大利亚概况的英语短文。地理位置位于南太平洋(th
- 3一件工作,甲单独做20 小时完成,乙单独做12 小时完成.现在先由甲单独做4 小时,剩下的部分由甲、乙合做,需要几小时完
- 4山脉也往往成为我国省级行政单位的天然界线,图中各数码所表示的山脉名称正确的一组是( )
- 5用所给词的适当形式填空。1. Today is June 1st, it"s ______ ( child ) Day.
- 6请根据下图,区分三种血管,并说明其结构特点。(1)A是___________,B是___________,C是_____
- 7Actually, girls can be _______ they want to be just like boy
- 8Were there ______ seals at the aquarium? [ ]A. a lots of
- 9请你用相应的化学符号填空.(1)地壳中含量最多的元素______;(2)两个氢氧根离子______;(3)氧化镁的化学式
- 10下列句子中,没有语病的一项是A.张艺谋执导的《十面埋伏》对于中国青年是不陌生的。B.这是一本好书,它能催人进取,促人猛醒
热门考点
- 1某人的尿中含有葡萄糖,尿量增多,尤其是夜间多尿,其机能异常的结构最有可能是( )A.肾小管B.肾小球C.肾小囊D.膀胱
- 2函数取得最小值时,的值是( )A.1B.2C.3D.4
- 3老鹰和麻雀都在空中飞行,如果他们具有的动能相等,那么( )A.老鹰比麻雀飞得快B.麻雀比老鹰飞得快C.老鹰比麻雀飞得高
- 4这幅图告诉我们①我国尚未进入小康社会②我国已总体上达到小康水平③我国还有部分人口没有解决温饱问题,各地区之间发展很不平衡
- 5下图所示为举世闻名的都江堰水利工程。在“5·12” 汶川大地震中,这一水利工程除鱼嘴部分有轻微损坏 外,其余基本完好。该
- 6—The cake is delicious.—Well, at least it is the o
- 7如图1,两个透镜共一根主光轴放置,且两透镜的焦点正好重合,完成光路图.(图2用文字填写)
- 8下列各装置中,能构成原电池的是 ( ) A B C
- 9已知椭圆和圆,且圆C与x轴交于A1,A2两点(1)设椭圆C1的右焦点为F,点P的圆C上异于A1,A2的动点,过原点O作直
- 10同温同压下,xg的甲气体和yg的乙气体占有相同的体积,根据阿伏加德罗定律判断,下列叙述错误的是( )A.x:y等于甲与