在
中,角A,B,C的对边分别为a,b,c,
.
(1)求A;
(2)若
,且
,求
面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac172d8fa9402c0b86706b3f028eeb2.png)
(1)求A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484b6bc017a320f56d888ca7bb8952f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/706d69af582d2326b00e2648e4960767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2023-05-05 12:41:42
|
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解答题-问答题
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【推荐1】已知
.
(1)若
为奇函数,求
的值,并解方程
;
(2)解关于
的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2929db6d85ea3929b84c4bbbf29851b4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c30fd1a9da889807c0baf0fd393b859.png)
(2)解关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea66f17c454ff99dd986daff59e1513.png)
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(0.65)
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【推荐2】已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65746db5e204fdb8e0afd81b629e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e1b986cde6b927f8ea96dde28b6381.png)
(1)求
的值:
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65746db5e204fdb8e0afd81b629e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e1b986cde6b927f8ea96dde28b6381.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8ff276273c33519e0d0bb3984f0d7b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914913583276365e10f4d59e7647d18c.png)
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【推荐3】已知cos α=
,求sin α,tan α的值.
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【推荐1】在中,
所对的边长分别为
,设
满足条件
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fefc90cff26a3ab3a3199502ca21486e.png)
(1)求角A的大小;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c1e84aaa7e1b5c1283075b36c72fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13a05f5aca98574bb1f927123490de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13a05f5aca98574bb1f927123490de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e376613966c52037e6a3f44f358843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fefc90cff26a3ab3a3199502ca21486e.png)
(1)求角A的大小;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03005d17bf564371ad29fea41f5c650.png)
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【推荐2】在
中,角
,
,
所对的边分别为
,
,
,且
.
(1)求角
;
(2)若
,
为锐角三角形,求
的周长的范围.
![](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/7d54cdacb9430d28916c67fc2ab1227a.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5742b2684d00be50a66e01c9acb6b51f.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】在
中,角A、B、C所对的边分别为a、b、c,已知A、B、C成等差数列,a、b、c成等比数列.
(1)求角A、B、C;
(2)若
,延长BC到D,使
的面积为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求角A、B、C;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb57d84f9bbcb3e30d4ce7e2e1e8604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ce6fc8bd1e43c3d1cb2c1b19af4629.png)
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【推荐2】已知
的内角
,
,
的对边分别为
,
,
,且满足①
;②
;③
.
(1)从①②③中选取两个作为条件,证明另外一个成立;
(2)若
为线段
上一点,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/8904522bf844b61febddc24346f8232f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abce03491b0d681cfc2db3a4fa57fb26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1016c221b13009494d5d6cc0887eb0e2.png)
(1)从①②③中选取两个作为条件,证明另外一个成立;
(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/c1f51b58ea5afc097968e707a75bbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
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【推荐1】某市为争创文明卫生城市,实行生活垃圾分类处理,将生活垃圾分为“厨余垃圾”,“可回收垃圾”,“有害垃圾”和“其他垃圾”四类,某企业在市科研部门的支持下进行研究,把厨余垃圾加工处理为一种可销售的产品.已知该企业每周的加工处理量最少为110吨,最多为150吨.周加工处理成本
(元)与周加工处理量
(吨)之间的函数关系可近似的表示为
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(1)该企业每周加工处理量为多少吨时,才能使每吨产品的平均加工处理成本最低?
(2)该企业每周能否获利?如果获利,求出利润的最大值;如果不获利,则市政府至少需要补贴多少元才能使该企业不亏损?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6342798336247608b7d571d66f9f38db.png)
(1)该企业每周加工处理量为多少吨时,才能使每吨产品的平均加工处理成本最低?
(2)该企业每周能否获利?如果获利,求出利润的最大值;如果不获利,则市政府至少需要补贴多少元才能使该企业不亏损?
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【推荐2】我国某一企业为了进一步增加市场竞争力,计划利用新技术生产某款高科技设备.通过市场分析,生产此款设备全年需投入固定成本200万元,假设该企业一年生产x千台设备,且每生产一千台设备,需另投入成本
万元,
,由市场调研知,该设备每台售价1万元,且全年内生产的设备当年能全部销售完.
(1)求该企业一年的利润
(万元)关于年产量
(千台)的函数关系式(利润=销售额-成本);
(2)当年产量为多少(千台)时,企业所获利润最大?最大利润是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/436a25a5007b4f98262f8e8311e6acfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d61c530468cb23741c1f0af7c99c01bd.png)
(1)求该企业一年的利润
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06daa8ed58287978ddb9177cc0642ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当年产量为多少(千台)时,企业所获利润最大?最大利润是多少?
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