已知
外接圆的圆心为
,半径为2,
且
,求:向量
在
上的投影向量的模.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d34dc0f7588a05e58a8d71aee84776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4389b837955d3dfb83a9af3423fceb03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbaeae7045ad94158cdf5ae97073bc17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34bf00aeba15bce2cdee8ab487388dc.png)
更新时间:2024-05-24 12:45:22
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相似题推荐
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【推荐1】已知平面向量
,
,
.
(1)若
,求
在
上的投影向量
的坐标;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c43a5977d88d6e6711987af2aaf753c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619858bd5b77aa1c5132446d8ecad1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5aa846a5b7c96fe2ce665eb1ea5f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】已知平面上四点,
,
,
,
.
(1)求面
及
;
(2)求
在
的方向上的投影.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8129b7aab82db77ae4c6ee9c200272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1bcabfe9592f32bb51f26b4be6098d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdfa6902bc41115d278610427f54fd11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fceda2c21b5fe04ece09f2cd5a95537.png)
(1)求面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9f9ecd03d1f69a6faf60c0defd399b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/939122ddbd0184f78522e2aedaf03cd0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe35c91649a5bea2518387a2b36e0c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbba7bff7720b3aa33f29936ede7819e.png)
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【推荐1】如图,设
,
是平面内相交成
角的两数轴,
,
分别与
轴,
轴正方向同向的单位向量,若向量
,则把有序数对
叫做向量
在坐标系
中的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/1ffbaba4-43f1-4b1d-9720-bb5f03076f2d.png?resizew=152)
(1)设
,
,求
的值;
(2)若
,计算
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5af20b2f8c1fba4470f9650989e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14069d21d32c724f0ebe3e311f114c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8315ec34019d719771152be2252106e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf39ca3294f5520518dd4f1c0609876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0725eb3ba34ec2631d77a36385628059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82973c2b6d1c407318545f1c0f32ec2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/1ffbaba4-43f1-4b1d-9720-bb5f03076f2d.png?resizew=152)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25e326fdf9e5456f48e8a99a069f379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f36374ce95a4945d0e58264c2b271f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fdffaca7c78d569cfeebb80bfc26329.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e36a989cef1bbeb220bcdbfbcc2dda9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e87b143b8e89334dda69da4671fbf8e.png)
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【推荐2】在
中,角
所对的边分别为
,且满足
.
(1)求
的面积;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b3fb2da3909e643ef238b8d0ac559e6.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/6e8672e5a62469f2569d4daf91a3bace.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b3fb2da3909e643ef238b8d0ac559e6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5afdf895ebbcb2cf7c94429aadeb8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐3】已知向量
与
的夹角
,且
,
,求
与
的夹角的余弦值.
![](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/fca81a3bdf849b4c9ebb73854d54b92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9936a46cc891744d4600f76bb92b694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6da08da2af81a46e41d2e5eba47acf20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b91254db5ff748150f449c5cdd256c.png)
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【推荐1】设向量
满足
,且
.
(1)求
与
夹角的大小;
(2)求
在
上的投影向量.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a321112ae2829a4783f7e4a1f022183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/515e48a6ec8a94f1db7650288b294b17.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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【推荐2】已知
为抛物线
的顶点,点
与
关于原点对称.
(1)求线段
的中点坐标;
(2)求向量
在
上的投影向量的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39698959ba7b4d735e0121144427cfb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1474926e4302dadfde4e3b9c3123589b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
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