在
中,角A,B,C所对的边分别是a,b,c,且
.
(1)求C;
(2)若
,
,D在线段AB上,且满足
,求线段CD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd8bb75bb6afc82c08888f2d54c8d56e.png)
(1)求C;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0019a40382ab3b0ed0b127f75eabe48b.png)
更新时间:2023-03-17 17:49:35
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【推荐1】
的内角A,B,C的对边分别为a,b,c,已知
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(1)求角A的大小;
(2)设D为BC边上一点,且
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(1)求角A的大小;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21143d45f8a1eec5a18f3b82c78ac217.png)
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【推荐2】已知锐角
的内角A,B,C所对的边分别为a,b,c,向量
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(1)求角
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(2)若
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边上的中线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2758285d3c1d8c16784edbc5f572fc26.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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【推荐1】△
的内角A,B,C的对边分别为a,b,c.已知
.
(1)求角B的大小;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2071fbe35d3686fddc37a085686d7533.png)
(1)求角B的大小;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8242f3a6a00149f6211bfce2dfc5c4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93859d1f7447247abf197a477e51839c.png)
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【推荐2】在
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,
,
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(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5883e2390020023a5b94bf031e8eda27.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe7a93172d308a58200e3c722fe1072.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5883e2390020023a5b94bf031e8eda27.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec4ec05b86d583e10f99d7f909ab75f.png)
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【推荐1】在梯形ABCD中,
.
(1)求AC;
(2)若
,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634e762b5de133427d07990a0336b23c.png)
(1)求AC;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9cb15f16cd3d9bde734b30b2719c7f8.png)
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【推荐2】如图,已知等腰
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(1)若点P是线段BC上靠近B的三等分点,试用向量
,
表示向量
;
(2)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4f0c1c9cca0555906d8a53e1a6803d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/67597b9c-5c1e-41a8-a4e7-e36b359ecc90.png?resizew=161)
(1)若点P是线段BC上靠近B的三等分点,试用向量
![](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/f7239b3f2d88c2e45e17e5de9ae1a332.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a099d206e63c961716535825e47a71.png)
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【推荐1】已知向量
,若
与
的夹角为
.
(1)求
;
(2)当
为何值时,向量
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互相垂直?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b24732913603e4c143555ec1b0eb8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6055b9615d8e4aff00442ca00f42207e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ac98c1eaf42f8538adc29ec552cc16.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadb52537a6679873489525e2f404b64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd9534eb6ae67a9a2ef6ba5eaf9cfcd7.png)
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【推荐2】已知向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e3d33a8f66715e36bd0677ddc06313.png)
(1)若
![](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/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f11ac1bd265894c8057f665c203051e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8094931022b6fc66907ae613e4d7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
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【推荐3】已知
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e310702748855c3edccd151aae0143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34fa8ea29001bb1f0c1e5157aff2fca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a6837d828ab4a78daf31be6d137cd9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb74499b8965b3f6c9acfbbb168df438.png)
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