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2012·上海长宁·一模 查看更多[1]
(已下线)2012届上海市长宁区高三教学质量测试理科数学
更新时间:2016-12-01 13:41:28
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【推荐1】在
中,内角
所对的边分别为
.若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
________ ;![](https://img.xkw.com/dksih/QBM/2020/8/26/2536400163127296/2539169551491072/STEM/b15d7c57c678463287eb8187efab7298.png?resizew=25)
________ .
![](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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd5b9bbd3d22bd2cef53dd4b9691257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
![](https://img.xkw.com/dksih/QBM/2020/8/26/2536400163127296/2539169551491072/STEM/b15d7c57c678463287eb8187efab7298.png?resizew=25)
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【推荐2】余弦定理的应用
利用余弦定理可解决以下两类解三角形问题:
(1)已知三边,求_______ ;
(2)已知两边和它们的夹角,求_______ .
利用余弦定理可解决以下两类解三角形问题:
(1)已知三边,求
(2)已知两边和它们的夹角,求
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