名校
1 . 在锐角
中,设角
,
,
所对边分别为
,
,
,
.
(1)求证:
;
(2)若
,
,
,求
的值.
![](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/f3f84a0099c7ef3665653eda28ba04a5.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65352567d20609ef444804df42d21a4e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e355dfe216245f3d14c713891588223e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd454e69236d3ece1583420fb552e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23725094c363fd158166a8698971694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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名校
2 . 在各项均为正数的等比数列
中,若
,数列
的前
项积为
,且
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67717fcb9f8b9c154f6a81631607da56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e74be91bfe4bc209da7539dbf9b72c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18699a2c86c738d20383a6433e39352d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
3 . 如图所示,在四棱锥
中,底要
为平行四边形,
,
,
,
底面
,
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/68674844-cd27-4699-abc8-76357848801c.png?resizew=200)
(1)证明:
;
(2)求二面角
余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b621b74fa78206cdc8b7c546304688f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0295460562cc916fe4c7d01627d447b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba4c15fb8fc3239d45bd4e7d8971f58e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6186fc8a54f772ec0a8122a1a097c6a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/68674844-cd27-4699-abc8-76357848801c.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87136d5f4908fa04dd99bc35a16f393.png)
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4 . 设不等式
,表示的平面区域为
,若直线
上存在
内的点,则实数
的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c23b7c936b65abe84e5e1543e9c1835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33d6cda3499bda60140e621efc39fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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5 . 体积为
的球有一个内接正三棱锥
,
是球的直径,
,则三棱锥
的体积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6158eea2b2b070781fd9e21762f35122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597c48e908fc503a6a1ec0e69ee689b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 执行如图所示的程序框图,输出
值为
![](https://img.xkw.com/dksih/QBM/2017/4/13/1665007857606656/1665034640064512/STEM/1f7a5a7b8973494eb7e2679df38a5fb9.png?resizew=158)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/2017/4/13/1665007857606656/1665034640064512/STEM/1f7a5a7b8973494eb7e2679df38a5fb9.png?resizew=158)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 在
的展开式中,含
的项的系数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f05a1fd7b83bb5755cd9dd9b328a03d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d800f03de80068a1172beac3a2c75587.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 某地区拟建立一个艺术博物馆,采取竞标的方式从多家建筑公司选取一家建筑公司,经过层层筛选,甲、乙两家建筑公司进入最后的招标.现从建筑设计院聘请专家设计了一个招标方案:两家公司从
个招标问题中随机抽取
个问题,已知这
个招标问题中,甲公司可正确回答其中的
道题目,而乙公司能正确回答每道题目的概率均为
,甲、乙两家公司对每题的回答都是相互独立,互不影响的.
(1)求甲、乙两家公司共答对
道题目的概率;
(2)请从期望和方差的角度分析,甲、乙两家哪家公司竞标成功的可能性更大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(1)求甲、乙两家公司共答对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(2)请从期望和方差的角度分析,甲、乙两家哪家公司竞标成功的可能性更大?
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9 . 已知一个几何体的三视图如图所示,则该几何体的体积为
![](https://img.xkw.com/dksih/QBM/2017/4/13/1665007857606656/1665034640195584/STEM/fe76fd3f4ec74a9fb17980342087ee58.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/2017/4/13/1665007857606656/1665034640195584/STEM/fe76fd3f4ec74a9fb17980342087ee58.png?resizew=257)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
10 . “
”是“
”的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27f27cbb8185c1974d715ff95f8801c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fadbc8111798fb6e3899e6cd65aadf9a.png)
A.充分不必要条件 | B.必要不充分条件 | C.充要条件 | D.既不充分也不必要条条 |
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