在
中,角A、B、C所对的边分别为a、b、c,有以下条件:
①
;②
.请从以上条件中,任选一个解答下列问题.
(1)求角B;
(2)若
,
的面积为
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe2264044b451148257db4f8a5f52891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212645e4bed05d0cbd01a6b18460df8b.png)
(1)求角B;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8653af649d2a1b22f50c8529ef43136d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb57d84f9bbcb3e30d4ce7e2e1e8604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2022-04-10 14:41:08
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【推荐1】如图,在
中,点D在BC边上,AD=33,
,
,
![](https://img.xkw.com/dksih/QBM/2012/2/20/1570756338638848/1570756344020992/STEM/f9035d44-100c-4042-b731-05d107dda4e2.png?resizew=155)
(1)求
的值;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cd0313ad23f4d75b3f57d0aa4bf7c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f06062572ddd10a03a5061ffef91d4c.png)
![](https://img.xkw.com/dksih/QBM/2012/2/20/1570756338638848/1570756344020992/STEM/f9035d44-100c-4042-b731-05d107dda4e2.png?resizew=155)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ff5fcad35756d6bc7b2baa9068ad63.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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【推荐2】在锐角
中,内角
的对边分别为
,且
.
(1)求
;
(2)若
是边
上一点(不包括端点),且
,求
的取值范围.
![](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/a9b35fca0f588af5d54b64a67edf29c7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a370bae620797e524540e14e9cada930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5713f55f8d1bd3d257ea68fe09c6c227.png)
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【推荐1】在△ABC中,a,b,c分别是角A,B,C所对的边,csin
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(1)求A;
(2)若AB=AC,D,E两点分别在边BC,AB上,且CD=DE,求CD的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c3c24b030426add1ce73d46cf8d4b1.png)
(1)求A;
(2)若AB=AC,D,E两点分别在边BC,AB上,且CD=DE,求CD的最小值.
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【推荐2】
的内角A,B,C所对的边分别为a,b,c.已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18fe466a8971b5990a7f137bb5c7fcc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b5c164f58a436b75026c228fea64e1.png)
.
(1)求b;
(2)求
内切圆的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18fe466a8971b5990a7f137bb5c7fcc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b5c164f58a436b75026c228fea64e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb1ec9c5eaed4c211a040a2a33fb7c91.png)
(1)求b;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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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)求角A的大小;
(2)若点D是边AB上的一点,
,
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab71bcd72543ca6e3231847264871e2e.png)
(1)求角A的大小;
(2)若点D是边AB上的一点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】
的内角
、
、
的对边分别为
、
、
,已知
.
(1)求
;
(2)若
,
的面积为
,求
的周长.
![](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/79998787e2d78b13494915896c446d19.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c65bea2c80af038768b74250c694e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】在△ABC中,角A、B、C对应边分别为a、b、c.
(1)若a=14,b=40,cosB=
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(2)若a=3,b=
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(1)若a=14,b=40,cosB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec5efba5a2b7fb879ffd79fcf73ff03.png)
(2)若a=3,b=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6bfd94f6f2f41148d785f6b8a0181d.png)
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【推荐2】
ABC中,角A,B,C的对边分别为a,b,c,已知点(a,b)在直线x(sinA-sinB)+ysinB=csinC上
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求角C的大小;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4156cd2b24fb9d799f4a5ea50d5ef382.png)
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