解题方法
1 . 已知
中,角
所对的边长分别为
,且满足
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c885e8032706feed854495e0f608aa04.png)
___________ ;若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdacd62fa681051bc00f2c7ddd12334.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/36aeb47e107a43c90ed05bc2d1f0fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1928df2c336e2b11be1e2c1974fc916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c885e8032706feed854495e0f608aa04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413f9851aad373d782ae62b308f1de85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdacd62fa681051bc00f2c7ddd12334.png)
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2 . 在平面直角坐标系xOy中,已知圆
,直线
,过直线l上一点P作圆O的两条切线,切点分别为S、T,且
,则实数a的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560adea7b0d4fbe4131fc41f3fcbd871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab2b183a9582a6d19a3b8ac002acf3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2cd768b4fef22ac926cca2732bf4046.png)
您最近一年使用:0次
2020-05-14更新
|
249次组卷
|
2卷引用:江苏省连云港市赣榆区智贤中学2020届高三下学期高考适应性考试数学试题
3 . 已知
,
的夹角为
.
求(1)
,
;(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7301b991189e04b8c905fcfb0d319f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa2fcefaf3d8868da0cb52877c5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
求(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce84639e780b0fb6a02bb700925ef7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc756d3be7775a8a8ddbe6fd62ae511a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b79749a462e88e0fb25a328b3fcbac.png)
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4 . 已知
、
为
的中线,
,
,且
与
的夹角的余弦值为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1142176aeceb3e9327d15063ce3fa6de.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d036188ce294e3c7427d0b7d2294fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c6cbb6f308715ba2e58c11e61dc7d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f30d314a642667fef559032264647366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1142176aeceb3e9327d15063ce3fa6de.png)
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名校
5 . 在
中,角A,B,C所对的边分别为a,b,c,已知
,给出下列结论:
①
的边长满足
;
②
;
③
;
④若
,则
的面积是
,
其中正确的结论序号是_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec2c3d6ef7d1d369f8873965630373f.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f318dae61e291e3c28eff545f44787.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c9877e9a2ec72b4dad5ad449da96be.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8036e5f384ceff16b7290d567556100f.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d447455ca3fa23710faaa4bd6b5d7c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c00f7e3c9b3ca278015e3ec031f102.png)
其中正确的结论序号是
您最近一年使用:0次
解题方法
6 . 如图,扇形
的半径为2,
,
是弧
上一点,满足
,
与
的交点为
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56eb7011453e6f2bb36fa1f539d6ac81.png)
__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d4466b715a813d165d562ea0a3622e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56eb7011453e6f2bb36fa1f539d6ac81.png)
![](https://img.xkw.com/dksih/QBM/2020/7/17/2507698328117248/2507792632315904/STEM/f12368f4bc7c4749b07f048ae9b5d558.png?resizew=167)
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13-14高三上·江苏连云港·期中
解题方法
7 . 设O是
的三边中垂线的交点,
分别为角
对应的边,已知
,则
的范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cb7403c7444c79687fdb4336fdff92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc932d96cbeffffd8c0e81db654cb93.png)
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13-14高三上·江苏连云港·期中
8 . 平面向量
与
的夹角为
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5154ce098d83928b357e01070762413a.png)
_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9bf2423499d45354dbc8377f1f04e16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854a5ec0706361532e6813567a849898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f87249431e2f4f03175404e39018a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5154ce098d83928b357e01070762413a.png)
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名校
9 . 已知点A,B,C均位于单位圆(圆心为O,半径为1)上,且
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ff3a77155464de11462a8dc6a494f6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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