解题方法
1 . 已知
,
,
和
的夹角是60°,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cd160e94583cfa2ea76af680966f75.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee2c2c4b37645e9456eb6f8e45dc868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd09c939bec644680e8587e8accfd905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9d806f27eecf5aee1e75bf35acbcd4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/964c64c610af9274ab57b28edc2f3c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cd160e94583cfa2ea76af680966f75.png)
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2 . 在
中,内角A,B,C所对的边分别为a,b,c,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598e2fa81da50344433e510fab75ad56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
A.![]() | B.![]() ![]() | C.![]() | D.![]() ![]() |
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解题方法
3 . 向量
与
不共线,
,
(
),若
与
共线,则
应满足( )
![](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/42ac56c50229b941ed1ac7c653a3687c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ebf3930a3a995c05a833765866272a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3c2709edf306025d40299aaf455aec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef3e9eb0c4bd9c899886668229c4c947.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
4 . 已知向量
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3a965d00b6b859d47ef7a35d94e39e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137b7aab11fe594db29771aee9280a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a31fbb1eaa5fdaa9fd734d62faabeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
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解题方法
5 . 设向量
,
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb11592a8871819f9045d311d420342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d12b22a1ed003a21a35e379d9c815745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668f0254cf71230731ceb71bfc0e07a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
A.![]() | B.0 | C.6 | D.![]() |
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6 . 复数
的共轭复数是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e43145e8b838e2214d3b235f97faf75.png)
您最近一年使用:0次
7 .
的值等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6be7a50080b8c50ad36475ff172f0e7d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 若
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ccb287e98a6a68b553969da381858fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
9 . 某学校开设5门球类运动课程、4门田径类运动课程和3门水上运动课程供学生学习,某位学生任选1门课程学习,则不同的选法共有( )
A.60种 | B.30种 | C.12种 | D.11种 |
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10 .
为直线
的方向向量,
和
分别为平面
与
的法向量(
与
不重合,
),下列说法:①
;②
;③
;④
.其中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135ff377b42532dce11ab0e40b120b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6279e798012e2a206f7de3dc7f73c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e506b6d8009cfc1e7847168418f1398e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9b2c3117321788078867bd0701743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/298986984584e399a120f011127bc2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99476114f082ef5ff02f4ec1bac182be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0029ce7f585b8b97c5995884bff6bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6961028a7bab662f7d4facb17a3367e.png)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次