已知
,
,
是
的内角.
(1)当
时,求
的值;
(2)若
,
,当
取最大值时,求
的大小及边
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ec6996bc9924e33001c8e09c929532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87490f0715ad2364a765110b2c1503ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5817084b1e3498be0566f31064266387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71b89c981d69a9f045ea00aa1fd40d0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8abff30fc308565d3a23dd2739e5c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368fc197b61e01fe6a4a168bb7b375cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255865ba91c912867ad8953d22e75bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
2017·上海闵行·一模 查看更多[2]
更新时间:2020-01-10 13:58:32
|
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解答题-问答题
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【推荐2】在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68c4dddb95303d0a7987cc5579d5f05.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098943e98ad321740f83f0bb67004598.png)
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解答题-问答题
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适中
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解题方法
【推荐2】如图:四边形ABCD是边长为4的菱形,∠ABC=
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![](https://img.xkw.com/dksih/QBM/2022/1/5/2887683522248704/2889328041705472/STEM/0a2b21cd2a38479f9a470780d2e1353f.png?resizew=216)
(1)求
;
(2)求当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdc606df12191cf0bee588c59eac4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d851749a651ca596427da675769a22e6.png)
![](https://img.xkw.com/dksih/QBM/2022/1/5/2887683522248704/2889328041705472/STEM/0a2b21cd2a38479f9a470780d2e1353f.png?resizew=216)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3e274022d14a0301ffa33ea7652244.png)
(2)求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88b43edf10fc6ac72ad194082a03e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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