如图,A,B是单位圆(圆心为O)上两动点,C是劣弧
(含端点)上的动点.记
(λ,μ均为实数).
时,当点C恰好运动到劣弧
的中点时,求
的值.
(2)若
时,求
的取值范围;
(3)若
,记向量
和向量
的夹角为θ,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4388577dc452ba9d9caf47d81e6f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1fd0fb512778a14af6873c655c8d31.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390574f9bccc91926d41aea14a7b047f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2bb14024e7a66ecb6016f20792abee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441e1cb44aa28a8f590aea5ae3bd25c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb55c0af0c1295dfc499f31a3e172b2.png)
更新时间:2023-07-27 20:25:02
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在
中,已知点
为线段
上的一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/50796287-1f71-44e5-aa2f-0c1d7d01697e.png?resizew=148)
(1)试用
表示
;
(2)若
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e00c102611796a2ab967cad03f0ab8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/50796287-1f71-44e5-aa2f-0c1d7d01697e.png?resizew=148)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ce8452874104c0cd05e731ec68aa93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec64476aaca08de0808afda3618109c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b321c9a9d0593593e851fea04895fd89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d162c29b1e484cfc87350dd68f00b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec2b2cd650e757d003fc051e0afc77ae.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在
中,点P为线段AB上的一个动点(不包含端点),且满足
.
![](https://img.xkw.com/dksih/QBM/2021/4/26/2708024779866112/2761274933764096/STEM/eec733f8-6253-47df-87c0-54168829b7c6.png?resizew=158)
(1)若
,用向量
,
表示
;
(2)若
,且
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8189f7b0ffe4d20bf0fad43b4ed589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f2d7479433c7111ed66a7858b99139.png)
![](https://img.xkw.com/dksih/QBM/2021/4/26/2708024779866112/2761274933764096/STEM/eec733f8-6253-47df-87c0-54168829b7c6.png?resizew=158)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1c3ea872a20fdc1843cb5ffce8a554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec64476aaca08de0808afda3618109c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3996be52d8ef55607bd4f8384034a33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680b47e9eb79fe5fb05e1df373a8cdd3.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐3】在平面直角坐标系中,
为坐标原点,点C是线段AB上靠近点B的三等分点.
(1)证明:
;
(2)已知
,且
,设函数
,求函数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7453d507d0c0c7c10d5f73dca6dceb5d.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f592333c9d2c33a328dd7ab5a84954f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb48434bdcafb5e084fc0b6396cb9469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5dc38aca1403f23e9ecc141e5589df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知向量
与
的夹角
,且
,
.
(1)求
,
;
(2)求
;
(3)
与
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905dd10639c9fef5ef8d66a124756140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6316d995f00623f05fc3d56a6cbe5f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db24e47304fec964e8cb9278280046bb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03497c8751eac317efaf3bba8e46eda8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28319a6c0551febf6103ebef28ed877d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e98af3e54554c93c3fe4c2a0aa6edd6.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d533f7c7b37c6a7318b3bdfa0ad06cbd.png)
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适中
(0.65)
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解题方法
【推荐2】已知
,
,向量
与
的夹角为150°.
(1)计算
;
(2)若
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573205b069979ca2f87af850121a4308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff106198baaf1d01e39c9c3807b79ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95fe455d29abac3a6f5329bccecd5aa5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34b38c38a7f64d656878704c21123e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知
的内角
的对边分别为
,且
.
(1)求角
的大小;
(2)若
是
的中点,
,且
的面积为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f2ca9d11f9f3f5803dd058da2d28da4.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d243dc081c8bb5879c02b16c3e54fa00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb57d84f9bbcb3e30d4ce7e2e1e8604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】已知点
,
,
是单位圆
上圆周的三等分点,设
,
,
.
(1)求证:
;
(2)若
,求实数
的值.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/732e8008564ec12576ac60e498b28067.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e42eacb57037d08cf18946fe8e33bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ee2e0dc73bc0f68063d55843ee2263.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac39ff50f6d368a9a434a87131f378a3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45400a499f0657a030803c3a2966f1a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题
|
适中
(0.65)
【推荐1】在△ABC中,AB=2,AC=
,∠BAC=60°,D为△ABC所在平面内一点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613b6f68439a635109f287076f2a6538.png)
(1)求线段AD的长;
(2)求∠DAB的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613b6f68439a635109f287076f2a6538.png)
(1)求线段AD的长;
(2)求∠DAB的大小.
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解答题-问答题
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适中
(0.65)
【推荐2】已知向量
且与向量
夹角为
,其中A,B,C是
的内角.
(1)求角B的大小;
(2)求
的取值范围.
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570702802026496/1570702807326720/STEM/d77ab427737045f69381b31e3e05e87a.png)
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570702802026496/1570702807326720/STEM/115df38e4bb741ac9e00d4fb1dd7edf6.png)
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570702802026496/1570702807326720/STEM/e71ff8d57293425c81f55b267ebe17eb.png)
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570702802026496/1570702807326720/STEM/d115c63753234abf992f78035dda3b7f.png)
(1)求角B的大小;
(2)求
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570702802026496/1570702807326720/STEM/f73c1c4c86d24cf9851a7ef70437fe9c.png)
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