名校
解题方法
1 . 在
中,
分别为角
的对边,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80efcaa1cbf224a8494106a1b45fb27f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3卷引用:【全国百强校】甘肃省兰州第一中学2018-2019学年高二上学期期中考试数学试题
2 . 已知
是
、
的等差中项,
是
、
的等比中项.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fe57d4fbae536de2e641d9d349fcf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a46e8e40d8fad5ba9f84bfb9628085.png)
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13-14高三上·甘肃张掖·阶段练习
名校
解题方法
3 .
中,内角
的对边分别是
,已知
成等比数列,且
.
(I)求
的值;
(II)设
,求
的值.
![](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/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b850b6c714abe0d117eae47783230b0.png)
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448d30c84529f004ea1efe7ba7c813c6.png)
(II)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9407f6e5b204d6f97ebb857fbc8e14f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
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2016-12-02更新
|
737次组卷
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9卷引用:【全国百强校】甘肃省兰州第一中学2018-2019学年高二9月月考数学试题
【全国百强校】甘肃省兰州第一中学2018-2019学年高二9月月考数学试题(已下线)2013届甘肃省张掖二中高三(奥班)10月月考理科数学试卷(已下线)2012-2013学年四川省成都七中高一下学期期末考试数学试卷2015届浙江省杭州二中高三仿真考理科数学试卷2015届浙江省杭州二中高三仿真考文科数学试卷2016届山西省山西大学附中高三10月月考理科数学试卷2016届山西省山西大学附中高三10月月考文科数学试卷广东省深圳市耀华实验学校2018届高三上学期(实验班)期中考试数学(文)试题广东省深圳市耀华实验学校2018届高三上学期期中考试数学(理)试题
4 .
的内角
所对的边分别为
,若
成等比数列,且
,则![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435169046528/STEM/8e88b0e17f6146d497c86f45bc8fd0f4.png?resizew=50)
__________ .
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435169046528/STEM/7f98f5d7e1b640ceb71184054a179be9.png?resizew=45)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435169046528/STEM/a852abf2318d48b1ad01837aac7d9969.png?resizew=49)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435169046528/STEM/8f01c7c16b194fffaaa7bd2a6cb2f4a2.png?resizew=40)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435169046528/STEM/4a436bc043f345859c6637dfc825f590.png?resizew=112)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435169046528/STEM/3d3a905c425f44b58441f0af6c235d77.png?resizew=45)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435169046528/STEM/8e88b0e17f6146d497c86f45bc8fd0f4.png?resizew=50)
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