在①
,②
,③
这三个条件中任选一个,补充在下面问题中,并给出解答.
问题:在
中,角
,
,
的对边分别为
,
,
,
,
,且______.求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5b6132bf6c1a1af6a04f132c9cf485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86be6aad13c208f6328024471dd5402f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba63b8c239f207c92eeb8ede414763c5.png)
问题: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/dbf530176292c760d6c2fbc9a364f2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
20-21高三上·全国·阶段练习 查看更多[6]
九师联盟2020-2021学年高三上学期12月联考(新高考)数学试题(已下线)黄金卷11 【赢在高考·黄金20卷】备战2021年高考数学全真模拟卷(广东专用)湖北省孝感高中2020-2021学年高三上学期12月联考数学试题山东省济南市历城第二中学2020-2021学年高三下学期检测数学试卷(一)湖北省荆门市钟祥市实验中学2020-2021学年高二下学期4月月考(1)数学试题山西省运城市康杰中学2021-2022学年高二上学期期中数学试题
更新时间:2021-01-05 14:30:43
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适中
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名校
【推荐2】已知
的内角
的对边分别为
,
,
,且
.
(1)求角
的大小;
(2)若
的中点为
且
,
,请写出
与
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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/72b2468e928c0e3f9a4554132de93135.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb689a793465929f004e561242fa993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74094c51b5ee19992e12e98bfab66d77.png)
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【推荐3】仙桃中学新校区有一近似矩形的水塘
,已知长
米,宽
米,为了便于师生平时休闲锻炼,学校计划在水塘建造三座小桥
和
,并要求
是
的中点,点
在边
上,点
在边
上,且
为直角,如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/e921e78a-ab68-45b1-a01e-0b8278b82c07.png?resizew=273)
(1)设
(弧度),试将三座桥的全长(即
的周长)
表示成
的函数,并求出此函数的定义域;
(2)建这三座桥,每米建设预算平均费用为1250元,试问如何设计才能使总费用最低?并求出最低总费用(结果保留整数)(可能用到的参考值:
取
取1.42).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd4997da49b3dfe98144ad13aed0d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e3ad33a186a955f03484e061dc646ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4c8c61a1d2919aba41ed3021d3a053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/e921e78a-ab68-45b1-a01e-0b8278b82c07.png?resizew=273)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49a5353792a94188f336831cfad0f5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd35bd406de97d29594aff377b213fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)建这三座桥,每米建设预算平均费用为1250元,试问如何设计才能使总费用最低?并求出最低总费用(结果保留整数)(可能用到的参考值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fbe3d71af16d0925975d1699824cc7a.png)
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【推荐1】在
中,角
所对的边分别为
,
,
,
.
(1)求
;
(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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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(1)求
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】已知
内角
的对边分别为
,且
.
(1)求角A;
(2)若
的周长为
,且
外接圆的半径为1,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/d627b54c3bb6a5e4f8a4cefab90a9ecd.png)
(1)求角A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】设
的内角
、
、
的对边分别为
、
、
,且
.
(1)求角
的大小;
(2)若边
上的高为
,求
.
![](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)
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(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37347c5526dd1951b65026ef1aedba9.png)
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【推荐2】在△ABC中,角A、B、C所对的边分别为a、b、c,满足
,请从条件①、条件②中选择一个作为已知,完成下列问题:
条件①:
,
;条件②:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9e8d0e1f357d052b2d9863a5909f07.png)
(1)求a的值;
(2)求
和△ABC的面积.
注:如果选择条件①和条件②分别作答,按第一个解答计分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421ff27c2def8b40bf012a9c3d8b9650.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb75557d217f59ef1f33e8da1ac0d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc2207730238af428cf26f28b856954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec21ee73ebbc19ad8162f9784256581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9e8d0e1f357d052b2d9863a5909f07.png)
(1)求a的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
注:如果选择条件①和条件②分别作答,按第一个解答计分
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【推荐1】已知a,b,c分别为△ABC内角A,B,C的对边,且
.
(1)证明:
;
(2)若△ABC的面积S=2,
,求角C.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a071b3271a35bf3eae29c9c774820333.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c45c4afdb30512752c377037e4c71e9.png)
(2)若△ABC的面积S=2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af039cad52ca4e1f1e322277bc81afd.png)
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【推荐2】古希腊数学家海伦著作《测地术》中记载了著名的海伦公式,利用三角形的三边长求三角形的面积.若三角形的三边分别为
,则其面积
,这里
,已知在
中,
,
.
(1)设
,试将三角形的面积s表示成
的函数;
(2)求s的最大值,并求三角形面积最大时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b086995408eae6ad3c9bbe498963e74a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f2d50ca5cc415bf6721faf2221d626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bfc0387785bf3c60f75ed3d34cc98a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求s的最大值,并求三角形面积最大时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b01adc561735ff5be9bb97266918f2.png)
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