名校
解题方法
1 . 在△ABC中,已知
.
(1)若点D为AB的中点,
,求
;
(2)若不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6a73fda4f2f86885f3f22b347ff6c7.png)
(1)若点D为AB的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5deb5430b7d69aa02b399a1c87cadd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf2743c965e63b856f45c9e581fcf719.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750b85199a0487c892ccfa2a1260aaff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
20-21高一·全国·课后作业
名校
2 . 如图,在
中,
,
,
.求:
的值;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b89e7ff008dea7530bdc4ea5b6419d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5cb63aeea0b37799404c8fec092b21d.png)
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2021-11-12更新
|
558次组卷
|
4卷引用:江苏省盐城市阜宁中学2021-2022学年高一下学期3月学情检测数学试题
名校
解题方法
3 . 已知
,
均为单位向量,它们的夹角为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00fc4ba13e65dcc73ecb5d8d1577dc7f.png)
A.![]() | B.![]() | C.![]() | D.13 |
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2021-05-04更新
|
540次组卷
|
5卷引用:江苏省盐城市阜宁中学2022-2023学年高一下学期第一次综合测试数学试题
名校
解题方法
4 . 在
中,
,
,
是
的角平分线.
(1)若
,求
的长;
(2)若
,且点P满足
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3bb1ec8dc337d5dfdb1240842d938b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1371fe98a65d8ebd840c8d98346b6d15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25ea966ef10e746835367a4a505d1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f08570fa5c12cccf5c1e4d125cb215c.png)
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2021-09-01更新
|
463次组卷
|
3卷引用:江苏省盐城市响水中学2021-2022学年高二下学期第二次学情分析考试数学试题
解题方法
5 . 已知
是夹角为
的两个单位向量,若
,则
与
的夹角为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10814bc3db929e79874befe96cf4e3d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044db27f3793193db031f34d1b59bf95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
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解题方法
6 . 如图,点A是单位圆O与x轴正半轴的交点,点P是圆O上第一象限内的动点,将点P绕原点O逆时针旋转
至点Q,则
的值可能为( )
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848519892844544/2869301210808320/STEM/9c797432-13f6-4e8f-8a7e-a103f296bb58.png?resizew=230)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0670e25f441721819a7788f4608e1c9d.png)
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848519892844544/2869301210808320/STEM/9c797432-13f6-4e8f-8a7e-a103f296bb58.png?resizew=230)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
7 . 在四边形ABCD中,
若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920353c00477977803751d903851f1ac.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbc2c8eddb592847ba938678cd9eaea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f8c92e05866e75ca1503feabee5f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920353c00477977803751d903851f1ac.png)
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2020-11-11更新
|
611次组卷
|
2卷引用:江苏省盐城市滨海中学2020-2021学年高三上学期迎八省联考考前热身数学试题
解题方法
8 . 已知平行四边形
中,
,
,
,
、
分别为
、
的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ee784332d042709378804d71b06201.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb552b9e21dbaba74d11aa747790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ee784332d042709378804d71b06201.png)
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2021-08-07更新
|
389次组卷
|
2卷引用:江苏省盐城市2021-2022学年高三上学期第二次大联考数学试题
名校
9 . 如图,在等腰梯形
中,
,
,
,
,点
和
分别在线段
和
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8d3ec392-0097-467b-ac71-61766cb7488e.png?resizew=161)
(1)若
,求
,
的值;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176822d1db2fd6726ec2e8ab733dfa8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d809626d493659af6f297326fa3f0e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8d3ec392-0097-467b-ac71-61766cb7488e.png?resizew=161)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/257b0d7e588a2465a4ce0d911114d445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd948a01f840010aaf456053245a0fc.png)
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2021-08-13更新
|
356次组卷
|
3卷引用:江苏省盐城市伍佑中学2021-2022学年高一下学期学情调研(二)数学试题
名校
解题方法
10 . 已知
与其内的两点
.且满足
.若
的最小值为
,并且有
成立,则
的值为_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ffbc423070f5d7ce2c72229066ee1cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e83ac5efc4c142c43c5e7a3e156c407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bea948ad5de810de15e4af738de8c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a902a50c94d4665bf97058430d8c612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba3caabb1cebe4f3358b56528df02e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9953cb8f83187c7d93a82bb899da3f31.png)
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