计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b34a4fb1596379c2298d802318abc61.png)
2018高一下·全国·专题练习 查看更多[2]
更新时间:2018-06-06 22:01:03
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解答题-问答题
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适中
(0.65)
【推荐1】在△ABC中,
分别是角A、B、C的对边,且
.
(1)求角A的大小;
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
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(1)求角A的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262bac683593fb156c3cb60e20c028b8.png)
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您最近一年使用:0次
解答题-问答题
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适中
(0.65)
解题方法
【推荐2】在
中,角A,B,C的对边分别为a,b,c,且
.
(1)求角A的大小;
(2)若角B为钝角,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d72f6473e2d7c9c643098e0ced088e.png)
(1)求角A的大小;
(2)若角B为钝角,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ecc3aaae2aa289591a3b632f1e0645.png)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】在
中,角
的对边分别是
,
的面积为
,且
.
(1)求角
的值;
(2)若
,求
的值.
![](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/76f0649064a085fb74c997fb507a9b6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f652a52e32b26b8fd8ea7e5c3d5285.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbcd5db62897d1e7a67d8fb4b8a9d91a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次