解题方法
1 . 如图,在
中,
,点
分别是
的中点.设
.
表示
;
(2)如果
,请判断
的位置关系?用向量方法证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1c68c71dedc4f7767be51893e60924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2c1c9f638336bdc11d3ccc135b5029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1eea45a8f50799dbe8ac66d5b920cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f320bdecd8a360273f0baabe8d4b27.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac476d780de3ed6aa25efa87f661ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de32260ba2cb998f3ffb8449cdaf7708.png)
您最近一年使用:0次
名校
解题方法
2 . 定义两个向量组
,
的运算
,设
,
,
为单位向量,向量组
,
分别为
,
,
的一个排列,则
的最小值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858abf937bceeabf58fa26f5e2ffa418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbea56fd5adb7789d6aa1de90b65286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/277a03c880a98dd28733c3ce21487b9b.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/17ccfda9afde4441cfd1d4df5fe9622d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858abf937bceeabf58fa26f5e2ffa418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbea56fd5adb7789d6aa1de90b65286.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/17ccfda9afde4441cfd1d4df5fe9622d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc9443a8230fb9f3726fc7cb6b3521.png)
您最近一年使用:0次
3 . 已知向量
,
满足
,
.
(1)若向量
,
的夹角为
,求
的值;
(2)若
,求
的值;
(3)若
,求向量
,
的夹角.
![](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/ce9883f16cdef5fb87fb9d6a9897d113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db24e47304fec964e8cb9278280046bb.png)
(1)若向量
![](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/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854e16eb319ee454088f5b527cf6c4d5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466821bb75badcfa72f433d106eaf246.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596a3ee5d8473fc6619ea7730e13325b.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b904789c43cb34d62bc40a4d8773735d.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
解题方法
4 . 已知正
的边长为1,中心为
,过
的动直线
与边
分别相交于点
.
,求
.
(2)求
与
的面积之比的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252073fc8a87858d4b6d4b08a5633d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e07c611d39260a3160ef7380df0fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679b22a0418a8d024288016731e21e81.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
5 . 已知
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b586215d139d6418cc7010caa7b8e7.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd5acc68e88a56f6c1b01fc6ca2d428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b586215d139d6418cc7010caa7b8e7.png)
您最近一年使用:0次
6 . 已知
,
与
的夹角为
,
为
外接圆上一点,
与线段
交于点
.
,求
;
(2)设
.
(ⅰ)试用
的函数表示
;
(ⅱ)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d64255de7162b1fa5f659732693daa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f605ec0729ce6d72237ad662a06862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc9656d8286c4d6fa309d6ae347c89e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41a475407451ed8427d0e7a483568c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eff576db012cc8a793b1afcb0b47fbe.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7983aade7a7c61f065c5bd3569fbd2.png)
(ⅰ)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f14d13e081ed59bab413a9f30b62e3.png)
(ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ef6d007c9539c08562fcc217ae131e.png)
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解题方法
7 . 若平面向量
与
的夹角为60°
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fe21e4310277189ba4082aae08cc88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c75a15198f2465863fd46e0794d0bf2.png)
A.![]() | B.![]() | C.10 | D.12 |
您最近一年使用:0次
解题方法
8 . 已知平面向量
,
,且
,
,向量
满足
,则
取最小值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a5451e35042092a0cdc5971a4d55e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37157acb52896b1d3d067adc7d381b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d3e5619718e1bb2592caf48bcc2718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5b0a4509691f41732a190fceef0175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
您最近一年使用:0次
名校
解题方法
9 . 若平面向量
,
,
两两的夹角相等,且
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7891ac38d0087802fafc88ec9e5bc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1fbde1de351bce74ea7736f16340a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7af485413186ab3208767bc6637fb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856257379ffdc3939b9aaea9007a6951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6b07640a27cf91c0a1c4d6c7457652.png)
A.![]() | B.5 | C.![]() | D.![]() ![]() |
您最近一年使用:0次
解题方法
10 . 已知
,
,
.
(1)求
;
(2)若
,求实数k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e310702748855c3edccd151aae0143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b532ff725ed321148010644e7f0e05f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7901fc86cb98cdb030d6ee72816dc14a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b195aa36a3c2753ebf08cb464c52ad1e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28366bd942f564a8bc3396dc85b1b73c.png)
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