已知
与
的夹角为
,且
,
.
(1)求
和
;
(2)当
为何值时,
与
垂直?
(3)求
与
的夹角.
![](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/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f18996bd00253c3ad9f91780103affb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03ef3e7fb905b47f36c4630fcc65dbe.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0fe4d834e8eaca89ceaf9c64cdabd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022030927a837bf502d1847da4e15dc9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa93e6d85e37a5dd4cf2e779080c536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f04039292017b48bb2232442e4511c1.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b57d4b52fc04039f5a5f8c9c6163748.png)
21-22高二上·福建厦门·开学考试 查看更多[2]
更新时间:2021-09-09 21:44:28
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图、在四边形
中,
,
分别为
,
的中点.
;
(2)若
,
,向量
,
的夹角为
,
,求
.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4e1bd75f9e49791a956b2e6d7155fb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f864244952b60f3648f08a19268efae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad48d2f436affbe799b0b66fe60a4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304a7f07db2ec637baadf8f0ab91c85c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c165c4555b95f639900a7c5929c1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a2d34c662a9e56b85e69a61d99d5e8.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知向量
满足
,
,
.
(1)求向量
与
的夹角的大小:
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3f5a708574ca78631988b5c00cae76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfec6cb1afa538f79b4aa6204cd30e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37157acb52896b1d3d067adc7d381b9.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d50f797c8e7e36192a66848357d3d2c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知
是同一平面内的三个向量,其中
.
(1)若
,且
,求
向量;
(2)若
,且
与
垂直,求
与
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0a32446aed06817f5f72abf7fdae4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b18f32baa8e324b33d707f8d59e0a4f8.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63aec503ed1d751bee61a5e0bab63c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd43c3c9a578b91fe832c4c2477103c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d6c95e3dea8594de08776567a349cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437dc907211c5934f938d869f6b19e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67a5673958e175b00200a75e645c73c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】已知向量
,其中
是夹角为
的单位向量,求
(1)
;
(2)
与
的夹角大小.(用反三角函数表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b3b8bd140151c50b941546e51d9169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42503437fb44722722cd20835f11d233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07882aa0d4087bd4e551dbfa437e31d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】已知
,其中
,
是单位向量且夹角为
.
(1)求
,
的夹角
;
(2)设
,若
,求
和
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4ce7ba0c9bb310692880565c754f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
(1)求
![](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)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7eb1ab97f9df99d72512ea7647b955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f280f438c5f81d59d249276a1ecf5524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】已知平面向量
、
、
满足条件
,
.
(1)求证:
是正三角形;
(2)试判断直线
与直线
的位置关系,并证明你的判断.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6346109f37e3dc80ddd36a45c588106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd7a1ebe8fbb29523c9f3739d0341866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52bc09d9e8d0d8dabe3919d46718d923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/046ca3db7f4264a1995d34e0a697d845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e85eb7cc073278726e8a2420d915d2e.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ac2dd55fa98f9bf10fcd95ce3169c3.png)
(2)试判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1652145a4785b50fa22fdd8c63f724b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee51946da54ce4130fefa5e488589d3.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知
是两个单位向量,
,且
.
(1)求
的夹角;
(2)若D为线段BC上一点,DC =2BD,求证:AD⊥AB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1238a7a8ce9db1a47ae0ac80d5ed70cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611ab4e3ede21cd03d0cf99675d9ed22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce69b7bf1677649ee5121f8a884f6f44.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1238a7a8ce9db1a47ae0ac80d5ed70cf.png)
(2)若D为线段BC上一点,DC =2BD,求证:AD⊥AB.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】如图,在
中,已知
为
边上的高.
;
(2)设
,其中
,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccab94ae9e02defda15cb0d53e563f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee2a3a104e7b138fbf4d8c22dc106ef.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342f09c33ef0eac1e1e984760872f511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68a83b4093280ea8750677f6828bf47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
您最近一年使用:0次