1 . 在数列
中,
为其前n项和
,若
.
(1)求
;
(2)若
,求
;
(3)求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fe3bb2cd0e4b1d84966455925bc2c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4555dca34cc0ad25f9648d19bcbb69da.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7716218a6ee26e21942094f993f42890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(3)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52c9237cb0b4acc568d4afb12997186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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解题方法
2 .
中,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c13fadefec9d4bad9149b6d5cd3e0e.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b86d43790babcdbbdc03493ee70928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c13fadefec9d4bad9149b6d5cd3e0e.png)
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2021-09-06更新
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2卷引用:西藏昌都市第一高级中学2021-2022学年高二上学期第一次月考数学试题
3 . 在△ABC中,角A,B,C所对边分别为a,b,c,若
,则b等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020cfec6d7a9622504b3ab30c8289e87.png)
A.3![]() | B.6![]() | C.2![]() | D.4![]() |
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2卷引用:西藏昌都市第一高级中学2021-2022学年高二上学期第一次月考数学试题
名校
4 . 在等差数列
中,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77dc2f6f53df3eeda1fb1dd6b0bac8ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa37e5661af68b263a3ed9030d4e9003.png)
A.20 | B.24 | C.27 | D.29 |
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6卷引用:西藏昌都市第一高级中学2021-2022学年高二上学期第一次月考数学试题
名校
5 . 在
中,
,
,
,则
的面积为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b903021571c1b57943a1a3274217654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.![]() | C.![]() | D.3 |
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20-21高一下·江苏南通·阶段练习
名校
解题方法
6 . 为如图所示,
的内角A,B,C所对的边分别是a,b,c,已知
,
,
,M为线段
上一点.
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730657963343872/2800934486310912/STEM/b41bfc72b28c43418f4212eddaace1b9.png?resizew=199)
(1)若
,求
的长;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d11a5a756d8fdd7b294c4f5fd63467b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730657963343872/2800934486310912/STEM/b41bfc72b28c43418f4212eddaace1b9.png?resizew=199)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fd840b59d167d248b333524e27fc10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337f585cc1d23b6fbacdaa3995c7874a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e8ecb371ce77dca5554e8e03b41386.png)
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3卷引用:西藏拉萨中学2021-2022学年高二9月第一次月考数学试题
西藏拉萨中学2021-2022学年高二9月第一次月考数学试题河南省新乡县高级中学2021-2022学年高二上学期第一次月考数学试题(已下线)江苏省南通市如皋市2020-2021学年高一下学期第三次调研考试数学试题
2021高一·江苏·专题练习
7 . 对于任意实数
,命题(1)若
则
(2)若
则
(3)若
则
(4)若
则
;(5)若
则
其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69c8493f7f004d5ca3ce093eb6d3936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa374da86764dc184a5c273947866721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae36bdd26007c5f3e38f67d5fd8bae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c194b34f5f285670d3cce0d6273ea531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cb0e46b4d033f3ec9f2b6fbdfac7ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce24ef5f0f80415dfe962ae9cfec0a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b807c74bb3aff866ced42b5091607a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c194b34f5f285670d3cce0d6273ea531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb54b1b3617ebc502cb44194cbcd1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51eb4a3e6e67d206b9609a99b635f4d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/830519b1053a1c85f10eba9b77e320af.png)
A.1 | B.2 | C.3 | D.4 |
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4卷引用:西藏昌都市第一高级中学2021-2022学年高二上学期期中考试数学试题
西藏昌都市第一高级中学2021-2022学年高二上学期期中考试数学试题广西桂林市桂电中学2021-2022学年高二上学期期中数学试题(已下线)2.1命题、定理、定义(备作业)-【上好课】2021-2022学年高一数学同步备课系列(苏教版2019必修第一册)(已下线)专题08 不等式基础题型汇总-2021-2022学年高一《新题速递·数学》(人教A版2019)
名校
解题方法
8 . 设
的内角A、B、C的对边长分别为a、b、c,
,
,求B.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60971cc477a7c7af12f5272387e49cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.png)
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解题方法
9 .
的内角
,
,
的对边分别为
,
,
.若
,则
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2681f0d1732bcaa8d6362fbd1fa6caa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.等腰且直角三角形 | B.等腰或直角三角形 |
C.等边三角形 | D.等腰三角形 |
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10 . 等比数列2,6,…,的前10项和的值为______
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