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1 . 已知复数
,
(
为虚数单位)在复平面上对应的点分别为
,则
的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95423c449f5d44dd949bf3b0130946f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6cef94c1bce90f6573fd0315db6b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7035cd4adda5d72a9fc9f9fda75995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38033198bf936b904a8c74db67e4cdcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5927f1967a8f72e8fb887edb5023a921.png)
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解题方法
2 . 在
中,角A,
,
对应的边分别为
,
,
,
.
(1)求角A;
(2)法国著名数学家奥古斯丁
路易斯
柯西(AugustinLouisCauchy,1789年-1857年)在数学领域有非常高的造诣.很多数学的定理和公式都以他的名字来命名,如柯西不等式、柯西积分公式.其中柯西不等式在解决不等式证明的有关问题中有着广泛的应用.
①柯西不等式的二维形式是对于任意的
,
,
,
,有
.请证明上述不等式,并写出等号取到的条件;
②请用柯西不等式的二维形式求
的最大值,并写出等号取到的条件;
③在(1)的条件下,若
,
是
内一点,过
作
,
,
垂线,垂足分别为
,
,
,借助于三维分式型柯西不等式:
,
,
,
当且仅当
时等号成立.求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cc48b9017b4828713efe931111e782.png)
(1)求角A;
(2)法国著名数学家奥古斯丁
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
①柯西不等式的二维形式是对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a876ecb804eb0553c246e5fcc40b708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2491417bf91398e74a0680b031cabb6e.png)
②请用柯西不等式的二维形式求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1034d80cc1e3c3edfbaf43a944b8a.png)
③在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13648bbc28fe0c92b9467dd10a3c6af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c1254b9aeec2bbd01d0eecca66d708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5ba135022def1bcc1cddea66496706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ebbd1d0e4d44a11d9b0d65e73eef212.png)
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3 . 已知平面向量
,
,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c067e4548a847026cd22a6af11b25a7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0979ead3a09ede4835e7fe77c87850f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d22a0d50465d1d420537ce001e0062f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 已知
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498e31243c96cee074159c14530ce929.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d769ab21af5365d3c00dc617375ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2eddd1067f72310406b09f19404f478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1c98c1d7820c49dff57282e1fbd554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91380b1b3ab45c1bbde349352ecd404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498e31243c96cee074159c14530ce929.png)
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2024-03-31更新
|
223次组卷
|
3卷引用:重庆市渝高中学&城口中学2023-2024学年高一下学期第二次联合质量监测数学试题
重庆市渝高中学&城口中学2023-2024学年高一下学期第二次联合质量监测数学试题重庆市育才中学校2023-2024学年高一下学期3月月考数学试题(已下线)第二章平面向量及其应用章末十六种常考题型归类(2)-【帮课堂】(北师大版2019必修第二册)
解题方法
5 . 已知向量
、
,且
,则
与
的夹角为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a29b360f552c75ed218c966319f492c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bbe4fd72e48f10e4600e803d4ff61a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f77f3f5c58c4aebe72881650d365ca9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
6 . 已知
是边长为4的等边三角形,D,E分别是AC、AB上的两点,且
,
,BD与CE交于点G,则
是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6335eb644513a522541b9542970e2469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70fadc1f2cd2ebbbbfd3fa2365b72319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06847a06dc2d8493cd4504797c1c7027.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 平面向量
与
的夹角为
,
,则
等于( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d66b22abccd7fd3c436adf0f70ff84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c84455ce96bb8ec069286945271a1697.png)
A.2![]() | B.2![]() | C.4 | D.![]() |
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2022-04-14更新
|
1296次组卷
|
4卷引用:重庆市第一中学校2021-2022学年高一下学期期中数学试题
名校
解题方法
8 . 已知向量
,
,
满足
,
,
,则
的最大值是______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7677fa4ecba4dd4005f5a1b52cf86b82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8ed66de4dba65ef7a2b03612185fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a882060813d786353b4dc33a764b2e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ffc403ded5faedb326b83d5d3f69a30.png)
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2021-12-04更新
|
2214次组卷
|
9卷引用:重庆市鱼洞中学校2021-2022学年高一下学期期中数学试题
重庆市鱼洞中学校2021-2022学年高一下学期期中数学试题重庆市第八中学校2022届高三上学期高考适应性月考(三)数学试题(已下线)6.4平面向量的应用C卷四川省资阳市高中2021-2022学年高三上学期第二次诊断性考试数学(理)试题(已下线)解密07 平面向量(分层训练)-【高频考点解密】2022年高考数学二轮复习讲义+分层训练(新高考专用)四川省资阳市2022届高三二诊数学理科试题安徽省阜阳市太和中学2021-2022学年高一下学期竞赛考试数学试题陕西省安康中学2021-2022学年高一下学期第二次月考数学试题四川省泸县第一中学2022-2023学年高三上学期期末考试数学(理)试题
解题方法
9 . 已知
,
,
,
,则
的取值范围( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efdb779cd0a0193c0013f5b70d8082f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b17299bd1b72ecdfc6cd48c134e941a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5ed27c30865ce029e0831ca0e8a35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66eefc9fe1722017e8e17cf6ce1f1ae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64dd46ef751407ae195bb1918f74a1f3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2021-11-16更新
|
1659次组卷
|
8卷引用:重庆市九龙坡区2022届高三上学期期中数学试题
重庆市九龙坡区2022届高三上学期期中数学试题(已下线)高一数学下学期期中精选50题(压轴版)-2021-2022学年高一数学考试满分全攻略(人教A版2019必修第二册)(已下线)高一下期中真题精选(压轴60题专练)-【满分全攻略】2022-2023学年高一数学下学期核心考点+重难点讲练与测试(人教A版2019必修第二册)(已下线)热点06 平面向量、复数-2022年高考数学【热点·重点·难点】专练(新高考专用)(已下线)易错点07 平面向量-备战2022年高考数学考试易错题(新高考专用)(已下线)第07讲 向量应用-【帮课堂】2021-2022学年高一数学同步精品讲义(苏教版2019必修第二册)(已下线)专题06 平面向量及其应用压轴题型汇总-2021-2022学年高一《新题速递·数学》(人教A版2019)(已下线)第9章 平面向量 单元综合检测(难点)-《重难点题型·高分突破》(苏教版2019必修第二册)
名校
10 . 已知向量
与向量
方向相同,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
___________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d33ee1f52775bf9ba66e0fdf0ecbb35.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9a81a146e252a0c3aa1b7c13ca9a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36b6e209eb7a593e7fdcf825a960113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d33ee1f52775bf9ba66e0fdf0ecbb35.png)
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