已知
的内角
的对边分别为
,若
,
.
(Ⅰ)求
;
(Ⅱ)当
的面积取最大值时,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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8822874be0984bab42943b353820dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
更新时间:2018-05-07 17:25:04
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】在
中,角A,B,C的对边分别为a,b,c.
,
.请再从条件①:
,
;条件②:
,
.这两个条件中选择一个作为已知,求:
(1)
的值;
(2)c和面积S的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fce7d9b6538d569d03982ba351eef0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6129fbf40a950fc8c516f0abaab21957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a40fab8145b93481a0cbfce5206bdf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1f488d5704094143b568567fa97264.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e551f3af8330e755046ed671d77e60.png)
(2)c和面积S的值.
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适中
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解题方法
【推荐2】在
中,角
的对边分别为
,若
,且
.
(1)求角
的大小;
(2)若
是锐角三角形,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/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93afad400a6d0bf8a91108b327383d87.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69225cfdfbc0a9a1ccfdd15c46353b8f.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】在
中,内角
的对边分别是
.已知
.
(1)求角
的大小;
(2)若
,求
的面积.
![](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/203ef80cc97411c7b7665d951ce925b0.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e5fec3ab3ecf77a65ef7a393ba56b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
解答题-问答题
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适中
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解题方法
【推荐2】在①
,②
,③
三个条件中任选一个补充在下面的横线上,并加以解答
在
中,角
,
,
的对边分别为
,
,
且______,若
,求
的面积
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085423182be41925c494f7a3d52a2d1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b63f13c587461426432358d5480438a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e2c08081134842da81bf81606c4cdb7.png)
在
![](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/6129fbf40a950fc8c516f0abaab21957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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解答题-应用题
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【推荐1】如图是某一河流地区平面示意图,
、
、
为三块湖泊区域,现在某勘测队要测量
之间的距离,为了减少成本只能在河流的西侧(如图左侧)测量.勘测队员在
处测得
,然后到
点测量出
,
,且
,最后又在
处测量到
,
,且
.(在本题目中
,
,以下计算最终结果都保留一位小数 )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/9d9d46a6-9549-4833-ad0d-daad83e3d1eb.png?resizew=131)
(1)请计算
的面积;
(2)计算
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3cbaef6648895a366bf56f415b70ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c38281177237124b4676a59ef68a98c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe6b81b8c10042089ed7b7eb29c38bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98572e48dc6663f0b42a39545a4fa574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ee06a6fd38158d6752c48c78102d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edd529b7c31a85e5a886b2c767e341a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4eb56722b850eaf455ad4a14e4f96ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df276e9b9424486d59c747f1227b213c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c08ff2ece09ac501f40bfa7a4d1f6c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/9d9d46a6-9549-4833-ad0d-daad83e3d1eb.png?resizew=131)
(1)请计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(2)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】在
中,已知
.
(1)求角
的大小;
(2)若
是
边上的一点,且
,
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba822b14c0ea820095f44ba5895c1a55.png)
(1)求角
![](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/1c754d39d50d1d6052fd77663b42d510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f759ab7a1a04d5654231c1dca345235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】在下列3个条件中任选一个,补充到下面问题,并给出问题的解答.
①
;②
;③
;
已知
的内角A,B,C所对的边分别是a,b,c,D为
边上的一点,______.
(1)求角C;
(2)若
为角平分线,且
,求
最小值.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6acf9838ad03f1eb1600f7e8ef2419b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/043f2de6e9440a1c04e961741365af99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c19fdd7527aea359dd98e41e2d85e9.png)
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)求角C;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】在
中,角
所对的边分别为
,
.
(1)求角
;
(2)若
,求
的范围.
![](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/e16dad8673c8e4d6daa0e075bb4f52f7.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fadd2e6f0aa16c2c466c904474ffc79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980ab4deb9e7f2bc9288787f5243a4d2.png)
您最近一年使用:0次