已知
,
,
,则
,
的夹角是__________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd4e1bd48df92de1b3b2f40af3187fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0dcbd9bee7f525791d36d8fc8268cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1d22589d0c894b0aef6f83de32abbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
更新时间:2019-09-26 18:33:21
|
相似题推荐
填空题-双空题
|
适中
(0.65)
【推荐1】已知点
,
,则向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b063cdd0ec01f7f055e1161744e7a657.png)
______ ,与向量
同向的单位向量为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7ac04d22c605992ef3b11ec466b4193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd4eead49faba71ad389d9de519bc1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b063cdd0ec01f7f055e1161744e7a657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b8c8af42c8753c545999e6bb0db7db.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】已知向量
,向量
,则
的最大值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3eb80a909b765ce01febac7435f4b34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7340b30573612a7918397e7fbf10cc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17d778567d4c81ae478f42ba56b057b.png)
您最近一年使用:0次
填空题-双空题
|
适中
(0.65)
名校
解题方法
【推荐1】向量
,
在边长为1的正方形网格中的位置如图所示,则向量
,
所成角的余弦值是__________ ;以向量
,
为邻边构成的平行四边形的面积是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/77461500-2804-4b9a-b071-ccd1630f2481.png?resizew=173)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐2】已知O,A,B为平面上三点,若
,
,动点P和实数
,
满足
,
,
,则动点P轨迹的测度是__________ .(注:当动点的轨迹是曲线时,其测度指其长度;当动点的轨迹是平面区域时,其测度指该区域面积.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbabeab7e7d0e4bcd21a188362b5b9f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22905409f038387f0e954a47384b60a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bca4c0ab83a3ca3b0ebf03281be74f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b381aeca13cc17c8217a6db4d2c2ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a22570173ffa333a304977f3ee7df28.png)
您最近一年使用:0次