已知
,
是夹角为60°的两个单位向量,
,
.
(1)
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833e1932d717cb075f8f2c021b42981b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5bca280c9c9b8c3ad3849c06b1106fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28572bfb755a3e498822df1094b9df3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4f8922889c57c70c6fa4e46ab28e9d.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0fe4d834e8eaca89ceaf9c64cdabd9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1cc86b7ff004a6ab4f88b7af2d58da.png)
20-21高一·全国·课后作业 查看更多[2]
更新时间:2021-11-12 15:57:53
|
相似题推荐
解答题-问答题
|
较易
(0.85)
名校
【推荐1】已知向量
.
(1)若
,求向量
与
的夹角;
(2)在矩形
中,
为
的中点,
为
的中点,设
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ca289332575ff7d777f2ad7ae0f4ae.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a5a9c890cd836b184d8462134122549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(2)在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5851c1ccd9937b6783fac09e300b8bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7173b357dec0dca7d6da123345089741.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐2】(1)已知
,且
,
,求
.
(2)已知向量
,
,求
与
的夹角
值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b958a367fa2f08b6202a5a6ebf5e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02af59613596682734297aebc578801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e405db6c09d6ab5739cabbb63cd3b3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854e16eb319ee454088f5b527cf6c4d5.png)
(2)已知向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69804de4a5c14675e2e4dfb5927d2165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0f1318945f75a2162e0593b4c436c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】如图,在
中,已知点D在边BC上,且
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958948985643008/2960693840912384/STEM/56c84e501b444c7fa2778166fdbc9bb5.png?resizew=182)
(1)若
,求线段BC的长;
(2)若点E是BC的中点,
,求线段AC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b922c7fc50a56933a6cb9d80b1e7bb6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc3f0ff8d944ac32bf96225e85e6908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958948985643008/2960693840912384/STEM/56c84e501b444c7fa2778166fdbc9bb5.png?resizew=182)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680f5d2533547bd9302a8caf496f4b88.png)
(2)若点E是BC的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/941eba4dbc1094107e1eeb02c8d8cd56.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐2】请你根据向量数量积的定义和性质,推导出平面向量数量积的坐标表示,即:已知
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c44622a3b1070041dd5786800081501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d047657fa5ff16ff1fd708c73c4e44f2.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐3】已知向量
,
满足:
,
,且
.
(1)求向量
与
的夹角.
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7958a6bddd1d578bbd6fbcb92e3f6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ff265969988f1f138700129e5d7a6d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d7320d72a6de4fccdba717bcd6f006.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16111d1425b87ba82ea6a706d1dfb3ef.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐1】已知向量
,向量
.
(1)当
为何值时,向量
与
垂直?
(2)当
为何值时,向量
与
平行?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a9c0919ff8d95eaa90e77af1e5c000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c88a8cf41e780e386338cc50c80d65.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41960bbc66bdc3b28be0138f83f9de5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f04039292017b48bb2232442e4511c1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41960bbc66bdc3b28be0138f83f9de5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f04039292017b48bb2232442e4511c1.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐2】在平面直角坐标系中,已知
,
.
(1)若
,求实数
的值;
(2)若
,若向量
与向量
的夹角为锐角,求实数
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5618d27a4010782412bc0dbbda61d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6761671da84d62ef7257cd5461dc3ae2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd63e5e54d82bd8e74020821703c9ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db0f7c2997e89bb727b843070802a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bca35e52b8430246a1cf96e9e617cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988f87fb46274899a28b1a36b36e9bc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次