已知△ABC的内角A,B,C所对的边分别是a,b,c,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d9853531b36ed966789b336b7e1b7f.png)
(1)求A;
(2)若
,D是BC上的点,AD平分
,求AD的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d9853531b36ed966789b336b7e1b7f.png)
(1)求A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0e2b99fcad7277474868f82524ed14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
更新时间:2022-05-05 22:54:23
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【推荐1】在
中,设内角
的对边分别为
.
(1)求
的大小;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f303d7c1b87d72a5f23c26004e6499.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a516329af432b2347773df3cd1a27263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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【推荐2】在
中,三个内角A,B,C所对的边分别为a,b,c,已知
,
,且
.
(1)求角B的大小;
(2)若
,
的外接圆的半径为1,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101188cb6a5eb434d33d662a82985d50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a659a11587e3296945d070e928e37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ee59964f020fc52b5ba66a3f5fcc3c.png)
(1)求角B的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4827f981a201f53b74651ff604521d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】在
中,角
、
、
所对的边分别为
、
、
,已知边
,且
.
(1)若
,求
的面积;
(2)记
边的中点为
,求
的最大值,并说明理由.
![](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/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea5e13817560256fb7351cbbabdc50d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3b4c796d2023364f72b1a6c3e7079c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1dae2c361a67058f84b57ba05ca4294.png)
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【推荐2】“不以规矩,不能成方圆”,出自《孟子·离娄章句上》.“规”指圆规,“矩”指由相互垂直的长短两条直尺构成的角尺,是用来测量、画圆和方形图案的工具,如题图所示,有一块圆形木板,以“矩”量之,较长边为
,较短边为
.现将这块圆形木板截出一块三角形木块,三角形顶点A,B,C都在圆周上,角A,B,C的对边分别为a,b,c,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/11/b2cbbf19-be49-4df0-a9ea-0feeb3d3ba4f.png?resizew=139)
(1)求c;
(2)若
的面积为
,且
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e727850281a1cb6b655ecd17098b9e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/11/b2cbbf19-be49-4df0-a9ea-0feeb3d3ba4f.png?resizew=139)
(1)求c;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79315ea6cf5640e036fc98332ad9ff7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe1edb1ecb6f6911a505ebbef921c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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【推荐1】已知△ABC的内角A,B,C的对边分别为a,b,c,且ctanC=
(acosB+bcosA).
![](https://img.xkw.com/dksih/QBM/2018/8/1/2030700511870976/2037004114624512/STEM/de5d12e5ac664aa598cc2732abfb1d82.png?resizew=17)
(1)求角C;
(2)若c=2,求△ABC面积的最大值.
您最近一年使用:0次
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解题方法
【推荐2】
中,角
所对的边分别为
,已知
.
(1)求
的值;
(2)若
是
上的点,已知
,
,
,求
的值.
![](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/e23061ee21f807d7b8ac211596d84c10.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/399d6c9c8aa3d63fba452e652b855f40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/395c8d0c2d490ffd4d6aadfb3517f9ec.png)
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