在
中分别
、
、
分别是角
、
、
的对边,且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5caaa240d7db9f48d3621de916f894ca.png)
(1)求角
的大小;
(2)现在给出三个条件:①
;②
;③
.试从中选出两个条件,补充在下面的问题中,______.______,求
的面积.
(3)当满足
时,求
的取值范围使得这样的
有且只有两个(直接写出结论)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/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/5caaa240d7db9f48d3621de916f894ca.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)现在给出三个条件:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe8fff55c06f220725f4124e45a1e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5f230e4b90954a11db30652d9efeb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)当满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2022-04-09 15:21:35
|
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解答题-问答题
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【推荐1】已知
的内角
的对边分别为
若
,
,且
.
(I)求
的值;
(II)若
,求
的值.
![](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/7132c2d8b2ff504e6c2ba36c4f6dcfaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f34365e5040ce6944115c8da61bf110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cdf6426f0eaa95c31648895d35fe165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11f594b16174b616c42abd2f78a2787.png)
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69225cfdfbc0a9a1ccfdd15c46353b8f.png)
(II)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d70009d48ea5ed5e20cc5eff3d557e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c2dbf9f00ba360a31ca4cf66ce5e6c.png)
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【推荐2】在
中,内角A,B,C对应的边分别为
,
,
都是整数.
(1)求
;
(2)若
的中点为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f489e379bdd10e500e18018ff4ffafcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e974141c1bc57f22b507f725ca9dfb15.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86befb7c05fc4a0074f354ef1658934.png)
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【推荐1】在
中,角
,
,
所对的边分别是
,
,
,且
,
.
(1)若满足条件的
有且只有一个,求
的取值范围;
(2)当
的周长取最大值时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.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/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cd81e24843cd02f223757877dfcb5e.png)
(1)若满足条件的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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【推荐2】在
中,
,
.
(1)求
;
(2)从条件①、条件②、条件③这三个条件中选择一个作为已知,使得
存在且唯一确定,求
的面积.
条件①:
; 条件②:
; 条件③:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4a3e4101e7471f39940f0e7c6f0751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9472be3ec78aa34e289b2e91e815c40.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
(2)从条件①、条件②、条件③这三个条件中选择一个作为已知,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3924566dd9dff74ae4606aae7d161f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5566e22509dbbbe9da1618edec9756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f4e9cce511bcf97dba854803044dc3b.png)
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【推荐1】在
中,角A,B,C的对边分别为a,b,c,已知
.
(1)证明:
;
(2)若
,
,求
的周长和面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73d455f4ba6a4d1144006fdc79f89c7.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a70d8f920d57c9c3f9cbffaf45c4055.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d2c413253fe5bc1f9287a35e6fc45eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】现有长度分别为1,2,3,4的线段各1条,将它们全部用上,首尾依次相连地放在桌面上,可组成周长为10的三角形或四边形.
(1)求出所有可能的三角形的面积;
(2)如图,已知平面凸四边形ABCD,AB=1,BC=3,CD=2,DA=4,
![](https://img.xkw.com/dksih/QBM/2022/7/16/3023824702865408/3026780799344640/STEM/ebc7f637931b47b3bcac4a09a29ebb04.png?resizew=137)
①求cosA,cosC间的数量关系;
②求四边形ABCD面积的最大值.
(1)求出所有可能的三角形的面积;
(2)如图,已知平面凸四边形ABCD,AB=1,BC=3,CD=2,DA=4,
![](https://img.xkw.com/dksih/QBM/2022/7/16/3023824702865408/3026780799344640/STEM/ebc7f637931b47b3bcac4a09a29ebb04.png?resizew=137)
①求cosA,cosC间的数量关系;
②求四边形ABCD面积的最大值.
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【推荐1】已知函数
.
(1)求
的单调递增区间;
(2)记
的内角
、
、
的对边长分别为
,
,
,若
,
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb6c82eb4d18a206991cfabd957d707.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)记
![](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/65724dac40ba703e8a29f0b5ede5d175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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【推荐2】某市拟在长为
的道路
的一侧修建一条供市民游玩的绿道,绿道的前一部分为曲线
,该曲线段为函数
的图像,且图像的最高点为
,绿道的后一段为折线段
,且
(如图所示).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/2310554e-eb08-4b54-9e20-1fb9d86dd1d4.png?resizew=191)
(1)求实数
和
的值以及
,
两点之间的距离;
(2)求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e7a7eb74c302ac80956af681616de2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606933719a24e9a5e214600b772a093f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d322346e7e78821b599b10b35e4566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ff9f79842ed7145b9a1b9a984c65e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52173c8cc44246823c2bee21a783b731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f22d73b3c2fc7414fe4e33b64b7317c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/2310554e-eb08-4b54-9e20-1fb9d86dd1d4.png?resizew=191)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23b488f961d9fde37feb7f5c497c0d9.png)
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