已知向量
满足:
为单位向量,且
和
相互垂直,又对任意
不等式
恒成立,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83c5803cc8c05849028a57c4bd4ee72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a06c8eae3652486cf9e416ce3a8ffc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b8e5990ef4ef314941a3154457a9d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7f85c530b9913a1b34e12e3bfcf536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd717ccba36f55241094085f04bf30b.png)
A.![]() | B.![]() |
C.当![]() ![]() | D.![]() ![]() |
更新时间:2024-05-25 23:25:40
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【推荐1】已知a,b,c分别是
三个内角A,B,C的对边,则下列命题中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若O是![]() ![]() ![]() |
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【推荐2】
的内角A,B,C的对边分别为a,b,c,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() |
B.若![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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【推荐1】已知
,且
,当
时,定义平面坐标系
为“
-仿射”坐标系,在“
-仿射”坐标系中,任意一点
的斜坐标这样定义:
分别为
轴,
轴正方向上的单位向量,若
,则记为
,那么下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f55b8836b41be612a52ca9caf97006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d26c9fc8cfa002f40ea3908575c8ad0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10814bc3db929e79874befe96cf4e3d4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5253a9a71037d60059b60237824193b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4035161af783c1c882a4d998fa68e4.png)
A.设![]() ![]() |
B.设![]() ![]() ![]() |
C.设![]() ![]() ![]() |
D.设![]() ![]() ![]() ![]() ![]() |
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【推荐2】在日常生活中,我们会看到两人共提一个行李包的情境(如图)假设行李包所受重力均为
,两个拉力分别为
,
,若
,
与
的夹角为
,则以下结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/6/5/2736438478569472/2782480905895936/STEM/bb0e29b0918647edb40c6582e83bcf93.png?resizew=171)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105e4375167e55f565f87b77847c9ad3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/2021/6/5/2736438478569472/2782480905895936/STEM/bb0e29b0918647edb40c6582e83bcf93.png?resizew=171)
A.![]() ![]() | B.![]() ![]() |
C.当![]() ![]() | D.当![]() ![]() |
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【推荐3】下列结论中正确的有( )
A.已知非零向量![]() ![]() ![]() ![]() |
B.已知四边形![]() ![]() ![]() |
C.已知非零向量![]() ![]() ![]() ![]() ![]() |
D.已知非零向量![]() ![]() ![]() ![]() ![]() |
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【推荐1】如图,已知长方形
中,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbcc5b0a00c4c641604890345888018.png)
A.![]() |
B.当![]() ![]() ![]() ![]() |
C.当![]() ![]() |
D.对任意的![]() |
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【推荐2】已知向量
其中
均为正数,且
,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b0f80c486fbff2c9faf9d86fa0b8544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c6853c64f96e3c98d3ef894a3691bb.png)
A.![]() ![]() | B.向量![]() ![]() ![]() |
C.![]() | D.![]() |
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【推荐1】下列说法正确的是( )
A.若非零向量![]() ![]() ![]() ![]() |
B.若非零向量![]() ![]() ![]() ![]() |
C.已知P是△![]() ![]() ![]() |
D.已知向量![]() ![]() ![]() ![]() ![]() |
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【推荐2】已知向量
,
,
是三个非零向量,则下列结论正确的有( )
![](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/d366d8fbb7258ee051f49977441e14a2.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() |
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【推荐3】下列说法正确的是( )
A.若![]() ![]() ![]() |
B.两个非零向量![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.已知![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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