在
中,有
,其中
分别为角
的对边.
(1)求角
的大小;
(2)设点
是
的中点,若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18f4e1a24fc4a8672e39bfdf5e2e1af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9ad150cb1e4cd8977d4cc3d99be17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
更新时间:2023-03-14 11:12:31
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【推荐1】如图,点
均在单位圆上,
.
![](https://img.xkw.com/dksih/QBM/2022/3/14/2936255861178368/2938732612534272/STEM/bb1aad9c-cf4a-4b75-931f-c53a1da03ace.png?resizew=174)
(1)若
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a1467ecf286e3cadaf5aa006606f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf04c8dea75da1916461a1dac7c55376.png)
![](https://img.xkw.com/dksih/QBM/2022/3/14/2936255861178368/2938732612534272/STEM/bb1aad9c-cf4a-4b75-931f-c53a1da03ace.png?resizew=174)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006685df25454672aa25fdfc11488831.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac51bffb8f476896081027b33f7ec25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853a39379c956f56fb8ff2060fc5c33b.png)
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【推荐2】在锐角
中,角
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(1)求角B;
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb0331454e621029a34d4e83cb98f99.png)
(1)求角B;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
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【推荐1】已知
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.
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0ae8e92dd3119d41f2c830ea526516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ace74bfb716753490ebe0e740ff5baa.png)
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(1)求B;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eeafcf620fff2161a9c7439d7026c4f.png)
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【推荐2】在三角形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0ae8e92dd3119d41f2c830ea526516.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6f7204648f19070aad6e8a49873b82.png)
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【推荐1】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
(1)求
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(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e30c0a5c92f50dce1f7624709950ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d5f9ed788b63b476325c2dc9b5b15d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐2】已知
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,
,
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,
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![](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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500d7e6ad67cf5373cea449734dec830.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a72335ff513c24f55115bd073ab7c9a6.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐1】某企业投资生产一批新型机器,其中年固定成本为2000万元,每生产
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万元.当年产量不足46百台时,
;当年产量不小于46百台时,
.若每台设备售价5万元,通过市场分析,该企业生产的这批机器能全部销售完.
(1)求该企业投资生产这批新型机器的年收入
万元
(2)求该企业投资生产这批新型机器的年利润所
(万元)关于年产量
(百台)的函数关系式(利润=销售额-成本);(注意单位的统一)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ba09382d556b3a297a212a19feb3987.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cab34d1a4b81fd0b515cc97b4533dcc.png)
(1)求该企业投资生产这批新型机器的年收入
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(2)求该企业投资生产这批新型机器的年利润所
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2972af8c65701183de194c358b83256c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)这批新型机器年产量为多少百台时,该企业所获利润最大?并求出最大利润.
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【推荐2】问题:正数
满足
,求
的最小值.其中一种解法是:
,当且仅当
且
时,即
且
时取等号.学习上述解法并解决下列问题:
(1)若正实数x,y满足
,求
的最小值;
(2)若实数a,b,x,y满足
,试比较
和
的大小,并指明等号成立的条件;
(3)利用(2)的结论,求代数式
的最小值,并求出使得M最小的m的值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57f879f6e8df7d5fb261328806260b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b546bb446a200cd5f443b25f64f807d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f86c800af77b70d7799500a45f91721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddab9f2cdfbb37f5d5845e7943910624.png)
(1)若正实数x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a34b5d58a31a7c5cfe9920695b786c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
(2)若实数a,b,x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ffc1644c7029219b88232145abbdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc5f85f56005d1828a804d397e129db.png)
(3)利用(2)的结论,求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a4f01a173a0d7c88040ca354e4e588f.png)
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