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解题方法
1 . 已知平面向量
、
、
满足
,且
对任意实数
恒成立,则
的最小值为( )
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7141ab1218fe2a746e305571209bcd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8891c4e0d2d98d3070164b4a48f5d692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2aafdbb391ae0050cef40c8d590cabe.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-11-17更新
|
3052次组卷
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5卷引用:上海市奉贤区奉贤中学2023届高三上学期期中数学试题
2 . 已知平面向量
,
,
,满足
,
,则当
与
的夹角最大时,
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7a1df960feef63dec4790d63f52279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b8a88a16125366536cb4ad658e0cf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4244dd3d11b8c8131ffecd896c12a27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f63b6011a8976f241564475cefdf7ca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7a1df960feef63dec4790d63f52279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b8a88a16125366536cb4ad658e0cf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d73e5a7d6ead7f895d659d604959d9c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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3 . 点
是三角形
所在平面上一点,且满足
,则三角形
的形状一定是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fa41134cc73cd9815a2845aa47bb1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
A.等腰三角形 | B.直角三角形 | C.钝角三角形 | D.不能确定 |
您最近一年使用:0次
2020-12-22更新
|
1008次组卷
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2卷引用:上海市奉城高级中学2019-2020学年高二上学期期中数学试题
名校
4 . 在
中,
分别是内角
所对的边,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d64a002b302b7d5163e06d3a7c6c668.png)
(其中
,且
则
的形状是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbf5887ebf0a2fb425dc594bb983585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edd51c782333e04862704165622ad68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d64a002b302b7d5163e06d3a7c6c668.png)
(其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4357e24d9eca5a3305e047c0a32481eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b92840aa53cedddfa1297e17db0bf3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
A.有一个角为![]() | B.正三角形 |
C.直角三角形 | D.等腰直角三角形 |
您最近一年使用:0次
2016-12-04更新
|
968次组卷
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7卷引用:上海市奉贤中学2018-2019学年高二上学期期中数学试题
2014·上海奉贤·二模
名校
5 . 三角形
中,设
,若
,则三角形
的形状是
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551030784/STEM/fcdf6024387a4bda9701e4a6efccf083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/043f47fb975f6044f94d2de2fa261c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c07cf7d2fa8617ddba8283102dc9bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551030784/STEM/fcdf6024387a4bda9701e4a6efccf083.png)
A.锐角三角形 | B.钝角三角形 | C.直角三角形 | D.无法确定 |
您最近一年使用:0次
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6 . 已知
、
、
为直线
上不同的三点,点
直线
,实数
满足关系式
,有下列结论中正确的个数有 ( )
①
;
②
;
③
的值有且只有一个;
④
的值有两个;
⑤ 点
是线段
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1151f8c08cbf023437e179bbeac74132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee21177a6c6f8778f4400f2de3f94165.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c594ce8ea75457957753206eacf5e7.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31d40d19588540c14a1fc1a4532146a2.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
⑤ 点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
2015-06-04更新
|
542次组卷
|
2卷引用:上海市奉贤中学2018-2019学年高二上学期10月月考数学试题