在平面直角坐标系内,已知
.
(1)若
,求证:
为直角三角形;
(2)若存在实数
,使
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6f3f74316fe810f060bfae627a4231.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
(2)若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8182465dd61e761cc46deb604bb9fb31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8637d84d767603a8a6b93e1b54686fa2.png)
更新时间:2021-12-14 08:40:03
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】若平面上三点的坐标分别为
,
,
.
(1)用向量法证明:
、
、
三点共线;
(2)设
是坐标原点,且四边形
是平行四边形,求顶点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afee0da488f6cb5f94d949ea26ac7eb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36212a7a753aa33a521f0fc27972a9a6.png)
(1)用向量法证明:
![](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)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341d9ce62bb00c654b206b35f329740b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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适中
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解题方法
【推荐2】借助三角比及向量知识,可以方便地讨论平面上点及图象的旋转问题.试解答下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/90867388-90eb-4fb0-ac26-aa7cf7fb2007.png?resizew=123)
(1)在直角坐标系中,点
,将点
绕坐标原点
按逆时针方向旋转
到点
,如果终边经过点
的角记为
,那么终边经过点
的角记为
.试用三角比知识,求点
的坐标;
(2)如图,设向量
,把向量
按逆时针方向旋转
角得向量
,试用
、
、
表示向量
的坐标;
(3)设
、
为不重合的两定点,将点
绕点
按逆时针方向旋转
角得点
,判断
是否能够落在直线
上,若能,试用
、
、
表示相应
的值,若不能,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/90867388-90eb-4fb0-ac26-aa7cf7fb2007.png?resizew=123)
(1)在直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5c3d56a50c4084115a7a02e4fbc866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3982ebdedf29c3890e6e891263bfbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)如图,设向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036459b957acadc3eebaf50c211aaff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b680f91c4a693cc9ab2c23f2e9114ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b680f91c4a693cc9ab2c23f2e9114ce.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708e3ae3b6c9976c5e3075639e02cf24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b11951040d04c988b498acccbfd249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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解答题-问答题
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适中
(0.65)
【推荐1】已知向量
的夹角为
,且
,设
,
(1)若
,求实数
的值
(2)当
时,求
与
的夹角
(3)是否存在实数
,使
?若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa2fcefaf3d8868da0cb52877c5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02c4a5ad4b595f21dc338a2b8e85d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd4d56312cdd50eaaa4a1e40b2b65c7.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45632b3ca6ab6c0b05df0d5a838c375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9856ad2a8dd1b673ec2cfa9ee0a1eaff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184c6736108865aa9ba3680f3d50526a.png)
(3)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/401078c16ea92130b47f728bea699c62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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适中
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解题方法
【推荐2】已知向量
.
(1)若
,求
的坐标;
(2)若
,求
与
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8bd0ecfb26aafac2f4be039786bb89c.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394518f518e8eee4c6370fdfe90e71b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0552194957afee4458d0bf0277ef8332.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
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名校
【推荐1】已知
,
,且
,
.
(I)求
和
的值; (II)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9510e0b8c0d880f40590d3831f70f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49780ca613a630c97f5cc8a980e8bf63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b127397392fdbd9882d244853250c27a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edb8f03d04ccb52a90c009b1c4d072e.png)
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fe57d4fbae536de2e641d9d349fcf1.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,正方形
中,
分别为线段
上的点,满足
,连接
交于点
.
;
(2)设
,求
的最大值和
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9bfb96c6a7b5bf01bb15042355ac215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f49d1de7c6dfc04b6e84e23eec0a1d7.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8979e5728aef6fa57b6970525afcb6c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a61103ea69687ba91d5b380c0e2238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d6a99033826bd1b44f58b9e11ff52e.png)
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