在
中,设内角
、
、
的对边分别为
、
、
,
.
(1)求角
的大小;
(2)若
且
,求
的面积.
![](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/a74654495524a42d7fb1ec628c165065.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036b23c94e305faaa1283996edc5b30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff7e62312dbd1cd5b50a6dc7fdfc166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
10-11高一下·四川成都·阶段练习 查看更多[2]
更新时间:2016-11-30 17:45:23
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解答题-问答题
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适中
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【推荐1】在
中,
的对边分别为
,若
.
(1)求角
;
(2)如果
,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/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9d14249321f48f6f6cb22233e7001c.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
【推荐2】如图所示,我市某居民小区拟在边长为1百米的正方形地块
上划出一个三角形地块
种植草坪,两个三角形地块
与
种植花卉,一个三角形地块
设计成水景喷泉,四周铺设小路供居民平时休闲散步,点
在边
上,点
在边
上,记
.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378386071183360/2421753435201536/STEM/fc98ebd4bec64d8397e90a54ba9ceb64.png?resizew=138)
(1)当
时,求花卉种植面积
关于
的函数表达式,并求
的最小值;
(2)考虑到小区道路的整体规划,要求
,请探究
是否为定值,若是,求出此定值,若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1de7da3ab92e70f135ea628a691167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40cae1138ce408cf7ebbe14f152d6e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a718a85add40589bbf788876a755a88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482002db587fa5dcc33454ebe5ace500.png)
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378386071183360/2421753435201536/STEM/fc98ebd4bec64d8397e90a54ba9ceb64.png?resizew=138)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15ba1b23c89abb1b4a8c2c1d9a8952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(2)考虑到小区道路的整体规划,要求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aaf8eabab38b2ede69584d907abbefc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
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【推荐1】已知
,
.
(1)若
,试判断
的形状,并证明;
(2)设
的中点为
.从下面①②③中选取两个作为条件,证明另外一个成立:
①
;②
;③
的面积为
.
注:若选择不同的组合分别作答,则按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466e8c438084aef563c6aaeff3bca583.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4fbbfca1b095178bbebcbb9faf807c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d57459c30b68b2e65e603249c639a6fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
注:若选择不同的组合分别作答,则按第一个解答计分.
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【推荐2】已知函数
.
(1)求
的单调增区间;
(2)设a,b,c为△ABC内角A,B,C的对边,已知
,
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3061b8c9e2ccc55c2b87272923ba3e15.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设a,b,c为△ABC内角A,B,C的对边,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3819e3abe5ba10dc15142a6a8a616ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0136c37c35c4db6f66be20a4b3a5c8f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d447455ca3fa23710faaa4bd6b5d7c8.png)
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【推荐3】如图,正三角形
的边长为4,D,E,F分别在线段
上,且D为
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.
![](https://img.xkw.com/dksih/QBM/2021/12/2/2863854821736448/2867461150695424/STEM/e2071a85-0e71-4d03-9942-b72720491055.png?resizew=204)
(1)若
,求三角形
的面积.
(2)求三角形
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e661d825b7a6061e4d26fe5c53df73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://img.xkw.com/dksih/QBM/2021/12/2/2863854821736448/2867461150695424/STEM/e2071a85-0e71-4d03-9942-b72720491055.png?resizew=204)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0175d8a8ffcea569a8421c95c1dad2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)求三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
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【推荐1】为改善居民的生活环境,政府拟将一公园进行改造扩建.已知原公园是直径为200 m的半圆形,出入口在圆心O处,A为居民小区,OA的距离为200 m,按照设计要求,以居民小区A和圆弧上点B的连线为一条边向半圆外作等腰直角三角形ABC(C为直角顶点),使改造后的公园如图中四边形OACB所示.
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(2)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/33d69e1f-f312-49f5-a0d5-4ebd43d65af0.png?resizew=173)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f95f180d559e6fbe628f802cc1605bd.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
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【推荐2】已知
分别是
三个内角
的对边,且
.
(1)求角
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(2)若
,点
在
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,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/237b7a2dca0bb5cb72b3f3d6d2e0f536.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb7e8d97b6ab9bcf69f5f40f7e01452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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