两个向量
,
的夹角大小为___________ .
![](https://img.xkw.com/dksih/QBM/2014/7/23/1571822255906816/1571822261559296/STEM/3163e30bc05e4eb3b457801c8253d413.png?resizew=57)
![](https://img.xkw.com/dksih/QBM/2014/7/23/1571822255906816/1571822261559296/STEM/d3bfa031166b45e6985039233f456f53.png?resizew=67)
14-15高二上·贵州遵义·期末 查看更多[2]
更新时间:2016-12-02 17:14:05
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填空题-单空题
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适中
(0.65)
解题方法
【推荐1】下列有关向量命题,不正确的是__________ .
①若
是平面向量的一组基底,则
也是平面向量的一组基底
②
均为非零向量,若
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fde8e39a2679babf24eb124ddda20ef.png)
③若
,则存在唯一的实数
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6836870d047ff2faeea5d05721f4058.png)
④.若
,则
的取值范围
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e6d89ba8bb303c05c35b920b66e8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82da8940c66b1dac1acb9be65ced10a4.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa7b0463c697d8e7ee9079b0b0fff6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fde8e39a2679babf24eb124ddda20ef.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d76ee2e81f447f84a3e0b39c0388ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6836870d047ff2faeea5d05721f4058.png)
④.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af9332f7c0baf6d105822a2d7adc829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9811e6a5941a72ea39cf9cb8679344c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d03bf96ad2b2ae8b1b44705af41d4d.png)
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【推荐2】如图,平面四边形ABCD中,其中
,
,
,且
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d60757674370d947f394eee28fc88c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b0f0cdb98fe345dccfa96b3be72b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6834a0601cbb9cb4b6065d25c370216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c736eaaf830b47fc97bef2b973b8a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e05e2052ee3020b977b231e01bdd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/67ee017a-7353-4a67-bc67-220f91a3c245.png?resizew=179)
您最近一年使用:0次
填空题-双空题
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适中
(0.65)
名校
解题方法
【推荐1】如图,边长为
的正三角形
的边
落在直线l上,
中点与定点
重合,顶点
与定点
重合.将正三角形
沿直线l顺时针滚动,即先以顶点
为旋转中心顺时针旋转,当顶点
落在l上,再以顶点
为旋转中心顺时针旋转,如此继续.当
滚动到
时,顶点
运动轨迹的长度为___________ ;在滚动过程中,
的取值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07452f7f2cb926d8209ea0d06a38267.png)
![](https://img.xkw.com/dksih/QBM/2021/5/17/2722990641930240/2763221345017856/STEM/9d1d00b641f14feda79a5c99316a855e.png?resizew=389)
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【推荐2】已知向量
,
,若
∥
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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