已知
,
且
与
的夹角为
,又
,
,
(1)求
在
方向上的投影;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0ae443a505d263c44a3d7515fd0170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf342e77c56e55a35bb1151bc215a3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423774449249f4f557af18cb2eab1b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/444f57ed98743b4df0fad7c7bf3dd4d2.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/316699c45f1c088945d0cd3bb46eecfb.png)
更新时间:2022-04-26 22:56:58
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【推荐1】如图,在
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解答题-计算题
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【推荐2】化简下列各式:
(1)(
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(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
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;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42518891f8d7c97b5fb700de3440257b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eec39ea9c89f33bbf117b60b39fbc34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1f02d666ecf3360b8f8e7e37975016.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc2f5ebf4a5f75d85e8b1ee7779a71a.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619321979a7c9e0dd54091b54d1a1114.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec30994403b717f08912732b22be5708.png)
(5)
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【推荐1】已知向量
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![](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/0817e4c901a4729662505086e7ec6c69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5943afb8ca75e69aa03dee57f9ae0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e3d33a8f66715e36bd0677ddc06313.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0fe4d834e8eaca89ceaf9c64cdabd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f11ac1bd265894c8057f665c203051e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
(2)求向量
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解题方法
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
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您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐1】已知向量
与
的夹角
,且
,
.
(1)求
,
;
(2)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)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0fe4d834e8eaca89ceaf9c64cdabd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c250094127e2b3c878d68213b60407.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.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】如图,设
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