记
是内角
,
,
的对边分别为
,
,
.已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
,
,b=4.
(1)求角A和边c.
(2)设D是BC边上一点,且AD 垂直于AC,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb1fd1147d3a0179c34318a25cae4e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe17e7f36390648255d1473d693aae85.png)
(1)求角A和边c.
(2)设D是BC边上一点,且AD 垂直于AC,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/744fc158cdd30fbf16eba679b31a0bf5.png)
21-22高三上·内蒙古呼伦贝尔·阶段练习 查看更多[2]
更新时间:2021-10-20 18:34:03
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适中
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【推荐1】在
中,内角A,B,C的对边分别为a,b,c,且
,
.
(1)求B;
(2)若
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e1bd4f72b3edd9647378d1191857fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff7e350df8c07621585910dd920aad1.png)
(1)求B;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】已知
中,
,且
.
(1)求
的值;
(2)若P是
内一点,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2c1599d9b9a6ead21b64f5b5f4c066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d7c12123a351925c35d5a9668ac395.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(2)若P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd53e72da78093bf8278fd1ec458f2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b852d74487ac1ad7c3113f63b56403c2.png)
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【推荐1】在
中,内角A,B,所对的边分别为
.已知
的面积为
.
(1)求
和
的值;
(2)求cos(2A+
)的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f80f699558ff62a31152df321b064f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46d2380152e6efc40909dad0ae96c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f80f699558ff62a31152df321b064f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4c9f99d0fac9bec5d148f4ebcf828e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dcfa3e340b3976832d450dd4ae7e7a7.png)
(2)求cos(2A+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
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【推荐2】如图,设
的内角A,B,C,所对的边分别为a,b,c,若
,且
,点D是
外一点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/38f46e23-6b19-45c9-8763-ecec54b1f093.png?resizew=157)
(1)求角B的大小;
(2)求四边形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7b02511f350c1335744fc92a9bd1270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f75522147f62f9d5b98589a68412b67.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/38f46e23-6b19-45c9-8763-ecec54b1f093.png?resizew=157)
(1)求角B的大小;
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】已知
的三个内角A,B,C的对边分别为a,b,c﹐且
.
(1)求角B;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093fd4065e1153b41313aa43231f3379.png)
(1)求角B;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4207b85750d0abae786da0175e228c66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】已知
的三内角
所对的边分别是
,向量
,且
.
(1)求角
的大小;
(2)若
,求三角形
周长的最大值.
![](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/da92579bf30d538179755b45cc2fc0a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4d070c5939bb0ec4a9d40d7e3c7d3f.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5742b2684d00be50a66e01c9acb6b51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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【推荐1】如图,在四边形
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/496af74d-0370-4124-b6d6-e329b33ae463.png?resizew=143)
(1)若
,
,求
;
(2)若
,
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/496af74d-0370-4124-b6d6-e329b33ae463.png?resizew=143)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3ac3a23bf91b117707ec6d6263936c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8483b575d83534f4761f1c3b60fa143f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e84651cfbf6a25234265baa7ef676ea.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a96fd5c137199d2d8e89ce2d7f70c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f909c5f6784b1493a5c4021ac5b5df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b2d6a936173ba65be10976db0821ff.png)
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【推荐2】如图,已知平行四边形
,
是
与
的交点,设
.
![](https://img.xkw.com/dksih/QBM/2020/1/13/2376189312073728/2377124892942336/STEM/3fa63633e157407ba54d58687c7e1cf8.png?resizew=236)
(Ⅰ)用
表示
和
;
(Ⅱ)若
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2020/1/13/2376189312073728/2377124892942336/STEM/46f0e4e4644145609d42a3bb555b5d7f.png?resizew=105)
![](https://img.xkw.com/dksih/QBM/2020/1/13/2376189312073728/2377124892942336/STEM/3fa63633e157407ba54d58687c7e1cf8.png?resizew=236)
(Ⅰ)用
![](https://img.xkw.com/dksih/QBM/2020/1/13/2376189312073728/2377124892942336/STEM/d3c5e8498dea4093b1032ce9f8fc9097.png?resizew=31)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d86ed5700cde027ca83174d9c10292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864bc25cd8428dc1824dd4129632fe6d.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2020/1/13/2376189312073728/2377124892942336/STEM/ab34663a2ea4491783f38e2e912ab26e.png?resizew=88)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7a42341edbc0b01ab0769c4c02c3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2561c1b31fee29f513c42c8b23a37e5a.png)
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