名校
解题方法
1 . 在锐角△ABC中,已知
.
(1)求
;
(2)若
,
,求△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28c86cc0be1efe66aa3b6bb03185cfbe.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5201fc26d013f6fb889933c0e32f5c53.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57152f1bd6a622070a8878b7f811731.png)
您最近一年使用:0次
2 . 已知数列
的前n项和为
,
,
,2,3,…,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9564cd27c23fe42f49b3c26f014d5fc2.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9f62781325acddbe6f2008e23243ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18eb85663e2ba2cafcb57b6b027ba8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9564cd27c23fe42f49b3c26f014d5fc2.png)
您最近一年使用:0次
2022-06-03更新
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856次组卷
|
4卷引用:北京市大兴区兴华中学2022届高三三模数学试题
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