已知a,b,c分别为△ABC的三个内角A,B,C的对边,
,且
.
(1)求角A
(2)若△ABC为钝角三角形,求△ABC周长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7404a7877691f083f1aa38e2e7452091.png)
(1)求角A
(2)若△ABC为钝角三角形,求△ABC周长的取值范围.
21-22高一下·重庆江北·阶段练习 查看更多[2]
更新时间:2022-03-28 18:54:05
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适中
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【推荐1】在锐角
中,角A,B,C的对边分别为a,b,c,且
.
(1)求角B的大小;
(2)若
,求
周长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bdd31043c300b09b096b518729cb7e7.png)
(1)求角B的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6129fbf40a950fc8c516f0abaab21957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】在
中,a,b,c分别是角A,B,C的对边,已知
.
(1)求角C;
(2)若
,且
为锐角三角形,求
面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75dd2254fba57b91b583023d5f3aa107.png)
(1)求角C;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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适中
(0.65)
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【推荐1】在
中,角
所对的边分别为
,
,
,且
.
(1)求证:角
成等差数列;
(2)若
,求
面积的最大值.
![](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/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/387fb85ce5097567fc4c37fa1a834753.png)
(1)求证:角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f546e8c3cff0ac79852e344be435b2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐2】已知
,
的内角
的对边分别为
,
,对
,都有
成立,从条件①,条件②,条件③中选择一个作为已知,
(1)求角
;
(2)求
周长的取值范围.
条件①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a31c67a17e593e1c453749d92787dd.png)
条件②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf0b9b24c44f56961262b7ed05b5f0cf.png)
条件③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a495b029206fc3596d09276719c40d.png)
(注:如果选择多个条件解答,按第一个解答计分.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cffd6ce2d8bb0714c90bf559381e852.png)
![](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/083a9b98c965034146fd31daedb6c3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018857ec6e498113b3b12a730d9313da.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
条件①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a31c67a17e593e1c453749d92787dd.png)
条件②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf0b9b24c44f56961262b7ed05b5f0cf.png)
条件③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a495b029206fc3596d09276719c40d.png)
(注:如果选择多个条件解答,按第一个解答计分.)
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【推荐1】如图(1),在梯形
中,
且
,线段
上有一点E,满足
,
,现将
分别沿
折起,使
,得到如图(2)所示的几何体.
![](https://img.xkw.com/dksih/QBM/2022/3/28/2946194862006272/2947453930414080/STEM/e9083dc8be6044a88319c4dad23872c4.png?resizew=242)
![](https://img.xkw.com/dksih/QBM/2022/3/28/2946194862006272/2947453930414080/STEM/2eb904752d184e1fb1dc0642eed1ae01.png?resizew=217)
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![](https://img.xkw.com/dksih/QBM/2022/3/28/2946194862006272/2947453930414080/STEM/e9083dc8be6044a88319c4dad23872c4.png?resizew=242)
![](https://img.xkw.com/dksih/QBM/2022/3/28/2946194862006272/2947453930414080/STEM/2eb904752d184e1fb1dc0642eed1ae01.png?resizew=217)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】在
中,角
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(1)已知
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(2)已知
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![](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)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0cadf28b2fe317d5a61269eabc174a.png)
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(2)已知
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您最近一年使用:0次
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适中
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【推荐1】在斜三角形
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(2)当
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(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980ab4deb9e7f2bc9288787f5243a4d2.png)
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【推荐2】已知
的内角A,B,C所对的边分别为a,b,c,
,且满足______.
请从以下三个条件中选择一个作为已知条件补充在题目上,并完成下面问题:
①外接圆半径
;
②
;
③
.
(1)求锐角
;
(2)求
的BC边上的中线的最大值.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
请从以下三个条件中选择一个作为已知条件补充在题目上,并完成下面问题:
①外接圆半径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a4f9fb86ea1da4c7f6726bc8fb06c76.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d627b54c3bb6a5e4f8a4cefab90a9ecd.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bceb96695cb0e7604b2557a748f541a.png)
(1)求锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
注:如果选择多个条件分别解答,按第一个解答计分.
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