已知A(-2,4),B(3,-1),C(-3,-4),设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4cbaa13c53b09f9647d431f1371b34a.png)
(1)求
;
(2)求满足
的实数m,n;
(3)若线段AB的中点为M,线段BC的三等分点为N(点N靠近点B),求
与
夹角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4cbaa13c53b09f9647d431f1371b34a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbdbbbbc2bad9affb457feb678201f9.png)
(2)求满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3384ab89b8388e8fa088995c7a5a770.png)
(3)若线段AB的中点为M,线段BC的三等分点为N(点N靠近点B),求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31d629200b2ad71705579061f2c0951d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ebe66f8ecc219d2dd8e99d5618e3131.png)
更新时间:2019-01-15 11:00:02
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【推荐1】已知
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【推荐2】已知
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,
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与
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的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6c8170dd3ad55d366c866dfa21c7df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd5fb552c79ab5d45b0aeafc06e58542.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7daebfb7f4f4276eab6915408d92c69f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd4b9ad667f6da79bc3a5737cbc1eee.png)
(2)向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f34de9f5bfd2e3d9f4e66ab6add753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4f7cbeafb28e289a0f5eef21ce1596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552355ddba8eef1ca3bf15eb53d79622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdd98836819f79b76830bf1491df66ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐1】(1)已知非零向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa2fcefaf3d8868da0cb52877c5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf70ea9d2b81767e13d4c8e1d3cbaba.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】已知向量
、
的夹角为
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(1)求
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的夹角的余弦.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5fbd20d908a21aafeb517bc349b6e3a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecce1ed933a1802df36b35805d6a144a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b98386771bbcbdb72732c37633dff29.png)
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