在
中,
,
,
,
.
(1)用向量
和向量
分别表示向量
,
;
(2)若
,且
为直角三角形,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3057f12093c260771c949fbbdde2fb23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41de2dc19939d99d890dce1469f2823d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35df2865beb3ed693b02d4e1de55bd60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0a353c75c28adf91be16f716455d0e.png)
(1)用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7530f038865d5650f3b8a3e5fcdfd0ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca50bed94ccea41ead1c1bbcda548f7b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888edad8dfb54c62f6c0e59519a41709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5201fc26d013f6fb889933c0e32f5c53.png)
更新时间:2023-05-07 19:22:17
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相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知正六边形
的边长为1,
(1)当点
满足__________时,
.
(注:无需写过程,填上你认为正确的一种条件即可,不必考虑所有可能的情况)
(2)若点
为线段
(含端点)上的动点,且满足
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(3)若点H是正六边形
内或其边界上的一点,求
的取值范围.
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(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031b408cf0f13c5ff6b2a0658bf7da9f.png)
(注:无需写过程,填上你认为正确的一种条件即可,不必考虑所有可能的情况)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5714a1b778ffd12aea0cbb90594d2ad6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
(3)若点H是正六边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3630d4afd5d68a009b0935c080c134bd.png)
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解题方法
【推荐2】如图,
是
的重心,
的延长线交
于点
,
,
分别是边
,
上异于端点的动点,且
.
![](https://img.xkw.com/dksih/QBM/2020/3/1/2410043700805632/2410097654923264/STEM/691968d204204ca1b5842d3e8f14fe44.png?resizew=191)
(1)试用
,
,
表示
;
(2)设
,
,证明:
是定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545024b0dde2863d94e91aa5d8fe2729.png)
![](https://img.xkw.com/dksih/QBM/2020/3/1/2410043700805632/2410097654923264/STEM/691968d204204ca1b5842d3e8f14fe44.png?resizew=191)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec64476aaca08de0808afda3618109c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b0ab2519d0fb666743993961daee47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c66dfa32251920240f8da967ebc5de9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52825853cd894f8ca3b78595b589bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258092767095914a847cc399b5d37c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f0b84ee4ed90face0993d4f4dda379.png)
您最近一年使用:0次
解答题-问答题
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适中
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解题方法
【推荐1】已知向量,
满足
,
,
.
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed492f7b29166ba5c1f0023b05a439c5.png)
(2)设向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29889df6caaa84711e82549294a0ccbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c95cd1e4875188ed60b31927cf5a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f92ffd4c85efa2d4a1692459a06cbbb.png)
您最近一年使用:0次
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解题方法
【推荐2】已知
,
,
;
(1)若
与
垂直,求
的值;
(2)求
与
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573205b069979ca2f87af850121a4308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9680e4c312c1bbbcf53be882fc6ed1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06088aa435aceaf189a667fe60b2156.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac99a273b6920085438b66ce74b31ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678b7b14eea6388437252d06631c21aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ca43808974777649a58258de1436d6.png)
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【推荐3】平面内向量
(其中O为坐标原点),点P是直线OC上的一个动点.
(1)若
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(2)已知BC中点为D,当
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与
的夹角的余弦值.
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d0b035a4c922d8921d1dfe2a72b8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91174b2336306191ba275a87864172b7.png)
(2)已知BC中点为D,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59880e470359d8e9faf6ae5ce155cf2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76782c6299c144c919de3213c60a7e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6df2df5ddac2a0dd377d1ae9430c358.png)
您最近一年使用:0次
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解题方法
【推荐1】已知向量
,
不共线,向量
,
,
.
(1)若
,求实数k的值;
(2)若
,
为相互垂直的单位向量,且
,求实数t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bd8a052e56b53a66497b4b55a968a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc155e36276a2226c40a1f4ef7a0f41a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65926c95e2e173965c6783bb04edde6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e10d60acd34d35c26ec5383f8011459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1f1f27caa29402edc7f184252e7c97.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7565d3689d09d7663544151dc3f237ad.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bd8a052e56b53a66497b4b55a968a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc155e36276a2226c40a1f4ef7a0f41a.png)
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您最近一年使用:0次
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解题方法
【推荐2】已知
,
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为非零的常数).
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94bf988bbcdf8c10711986ac402db7d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6416fce7acd7ba66da74fb7544923f.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bca35e52b8430246a1cf96e9e617cce.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22258ad67d6d91f2641db185db66f3a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ab975c1d043e32d9f9d78c6b65a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de794a4b139019c9602874adc57b2351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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