1 . 如图,在四面体
中,
平面
,
,
,点
在线段
上.
是线段
中点时,求
与平面
所成角的正弦值;
(2)若二面角
的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba924d427bf2df79144e2611f50ad00f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6a0cee8226e82cc57916e10d533369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d8c176e0c2b435675a3b8efab0e498d.png)
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2 . 在二项式
的展开式中,第5项和第6项的二项式系数相同,
(1)求所有偶数项的二项式系数的和;
(2)求各项系数绝对值之和.
(3)若记
,求展开式中
中取最大项时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68fb64e252a20d360cf890d9603a181.png)
(1)求所有偶数项的二项式系数的和;
(2)求各项系数绝对值之和.
(3)若记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f826552f5b0546132e7c0b72bfd4b8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/857641f5cae585bd4655193270a7dae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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3 . 某机构组织举办经验交流活动,共邀请了八位专家,以
区分,现安排专家发言顺序,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/834e7d318fd832c73f1065259d62d988.png)
A.![]() ![]() ![]() |
B.![]() ![]() ![]() |
C.![]() |
D.![]() ![]() ![]() |
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名校
解题方法
4 . 为普及安全知识,某单位举办了一场安全知识竞赛,经过初赛、复赛,有甲、乙两个代表队(每队三人)进入决赛,决赛规则如下:共进行三轮比赛,每轮比赛中每人各答一题,每答对一题得 10 分,答错不得分. 假设甲队每人答题正确的概率均为
,乙队三人答题正确的概率分别
.
(1)若决赛中三轮总得分大于70分就能获得特别奖,求乙队获得特别奖的概率;
(2)因两队在决赛中得分相同,现进行附加赛. 规则如下:甲,乙两队抽签决定谁先答题,每队每人各答题一次为一轮,有两人及以上答对就算成功答题,并继续下一轮答题,否则换另一队答题,连续两轮成功答题的队伍获胜,比赛结束. 求附加赛中甲队恰好在第5轮结束时获胜的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3783f11b078c7b7262f28e2e90bf334.png)
(1)若决赛中三轮总得分大于70分就能获得特别奖,求乙队获得特别奖的概率;
(2)因两队在决赛中得分相同,现进行附加赛. 规则如下:甲,乙两队抽签决定谁先答题,每队每人各答题一次为一轮,有两人及以上答对就算成功答题,并继续下一轮答题,否则换另一队答题,连续两轮成功答题的队伍获胜,比赛结束. 求附加赛中甲队恰好在第5轮结束时获胜的概率.
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5 . 国家二级文化保护遗址玉皇阁的台基可近似看作上、下底面边长分别为
,
,侧棱长为
的正四棱台,则该台基的体积约为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71a41641aa0d0e45a3c03d3d2c1196b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7854968bbf6576a1fd9926ee0d4d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36b51b654efcff60d2d640b9b4c4471.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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今日更新
|
541次组卷
|
3卷引用:江苏省南通市如皋中学2024届高三下学期高考适应性考试(三)(3.5模)数学试题
6 . 求值:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9574e1c06fd2dc9ccbae5d137fd0af5b.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac4d516a6f25f72b7b5ec791fee421b.png)
(3)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9574e1c06fd2dc9ccbae5d137fd0af5b.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac4d516a6f25f72b7b5ec791fee421b.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1762dbbbf7d267b7332fe2706e754c.png)
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7 . 已知
,下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b354e6c7519f6058962733b8eedbbe.png)
A.![]() |
B.![]() |
C.若![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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解题方法
8 . 如图在
中,
,
,设
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb95d089784702a0b6d459f18a4e1e72.png)
表示向量
.
(2)若
,
,
,求
.
(3)若
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a84ab6721f8f7f510b54ae9ba5ef81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4464d66a6064905e521a946843ceff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e923e4cdcbea6a029f5ba188a59229d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb95d089784702a0b6d459f18a4e1e72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0531c57fe21c3c5ada307af8d49f3b0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c278812c4813f6391c7993574e2f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59ab6bf6111dda4a3d428454768b77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2a8d0c77c54fdf9aa97978f8e5dc0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7ab10c3b9021757e9a89ab47807484.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b47a08a25693bbfa01026573625ad15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a88dc7dc9cd668a57138e1ec71ea2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e811dee23eb88d9f05fbdc9fbabf77b.png)
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9 . 已知复数
在复平面内对应的点在虚轴的正半轴上,复数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0db5c1993bdf3e6ce4810533d62c90de.png)
(1)求
,
的值;
(2)求
,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa925e867d123a41814d16e77e9b59e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0db5c1993bdf3e6ce4810533d62c90de.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fe57d4fbae536de2e641d9d349fcf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17ca1e9283fc7ac1b1e427ef0310fc2.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c529ba8284ac452d88405f8dfc3b316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f798a9af75a091a8be0b71f2038260.png)
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10 . 已知复数
在复平面内对应的点为
,且满足
,
为原点,
,求
的取值范围______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ba67a21c7f856f3fe01267dfa7e842e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c59f0e35b7ae5206e45878934482b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0edccfab33b208c831aa8c8c460158.png)
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