解题方法
1 . 在△ABC中,a、b、c分别为角A、B、C所对的三边长,若
,则角B的大小为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d5573312264b80e1ca8eb851a30e71e.png)
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2 . 已知数列
为等差数列,首项
,公差
,若
,
,
,
,
,
成等比数列,且
,
,
,则数列
的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793b85e2442d2b9dca2efed03fa3d995.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8ebcd5b8f8ae04513834a70575816f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3aaabba90eefb861068bf014f9d0b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d745f422af19d28303b7fbc3a08a9ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b625d02d9054af978b5fb6ec9bee787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eaa992a449b828df0ff545e233b279b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7878f57ca07692f6295d5fbb1067f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75014d1aa28653974bd19c65bdec930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24653e3a6150f8c0a5a99529163b3bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793b85e2442d2b9dca2efed03fa3d995.png)
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真题
3 . 一工厂生产了某种产品16800件,它们来自甲、乙、丙3条生产线,为检查这批产品的质量,决定采用分层抽样的方法进行抽样,已知甲、乙、丙三条生产线抽取的个体数组成一个等差数列,则乙生产线生产了_____ 件产品.
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2016-12-04更新
|
738次组卷
|
6卷引用:2015-2016学年广东仲元中学高二上学期期中理科数学试卷
9-10高一下·河北石家庄·期中
4 . 设变量
满足约束条件:
则
的最小值为____________ .
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284845056/STEM/0311012c38314d3ca6bdda90b4ffca03.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284845056/STEM/de142edd54c64729a7af899a226f4d7a.png?resizew=82)
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284845056/STEM/56526313c143408889335e4eb8844790.png?resizew=67)
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解题方法
5 . 在
中,若
,则
必是______ (填锐角,钝角,直角)三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f72884d04e93575102295dd9cdc3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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6 . 已知
都是正数,如果
,则
的最小值是________ .
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284812288/STEM/28974ef7d05d49b7909f9f8cd9286977.png?resizew=26)
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284812288/STEM/1414ff54b44e415fa40083473c33d7c7.png?resizew=46)
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284812288/STEM/38c6bace6587463fbb67b210231ea847.png?resizew=35)
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7 . 设
满足约束条件
,则
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502221455360/1572502227525632/STEM/45c4bd88f7254815b4dd98c565e48ae9.png?resizew=76)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1995404eb114809bc18fbdb4f1388b2.png)
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8 . 设变量x,y满足约束条件
,则
的最小值为_______ .
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719798784/STEM/f0d7cb5858ba46619ce4adbb51892496.png?resizew=97)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719798784/STEM/8e6745efa801479b85b9510c42ca2821.png?resizew=69)
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9 . 已知等差数列
满足
,则![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719774208/STEM/b1720e40b73744c4b9c5ca67adddd887.png?resizew=113)
________ .
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719774208/STEM/81c63df70e04471391156d3370f2feda.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719774208/STEM/3046e3534ec54805986933df0929d788.png?resizew=113)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719774208/STEM/b1720e40b73744c4b9c5ca67adddd887.png?resizew=113)
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10 .
ABC的内角A,B,C所对的边分别为
,且
成等比数列,若
=
,
=
,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6595597d25112f247753397d25bf5080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46d2380152e6efc40909dad0ae96c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46d2380152e6efc40909dad0ae96c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e5d4f93699f8dcffb0e7840ca5597e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954795d1842974a705f9468f3b952ab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1311f32edf13f8caee5edb03f24a7ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3044579777a3e3b6f82c222908d128c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
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