1 . 在
中,
,
,M是
的中点,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e93d7fd1aa177f3561fd18c1698b04c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5fe7c5e288ffc80b6f4e5298a8acb10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e93d7fd1aa177f3561fd18c1698b04c.png)
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2 . 已知复数z满足
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91958e4187dcb9cf79f4191b921a0f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de971553ea8a66d7849b138a4a0625c5.png)
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3 . 已知向量
,
,
为非零向量,下列说法正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
A.若![]() ![]() ![]() |
B.已知向量![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.已知![]() ![]() ![]() |
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4 . 直线l与平面
成角为
,点P为平面
外的一点,过点P与平面成角为
,且与直线l所成角为
的直线有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb94bd9eb80fb9f5f02f518bb8f2211.png)
A.0条 | B.1条 | C.2条 | D.4条 |
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5 . “村超”是贵州省榕江县举办的“和美乡村足球超级联赛”的简称,为了解不同年龄的游客对“村超”的满意度,某组织进行了一次抽样调查,分别抽取年龄超过40周岁的游客和年龄不超过40周岁的游客各100人作为样本,每位参与调查的游客都对“村超”给出满意或不满意的评价.调查结果如下表.
(1)根据列联表中的数据,在犯错误的概率不超过1%的前提下,可以认为游客对“村超”的满意度与年龄有关吗?
(2)若将频率视为概率,该组织从某日所有游客中随机抽取3名游客进行现场采访,记抽取的3名游客中对“村超”满意的人数为
,求随机变量
的分布列与数学期望.
附:
.
年龄 | 满意度 | 合计 | |
满意 | 不满意 | ||
不超过40周岁 | 60 | 40 | 100 |
超过40周岁 | 80 | 20 | 100 |
合计 | 140 | 60 | 200 |
(2)若将频率视为概率,该组织从某日所有游客中随机抽取3名游客进行现场采访,记抽取的3名游客中对“村超”满意的人数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dc70b5e1ba847b9918a50f67bfbe8f.png)
0.1 | 0.05 | 0.01 | 0.005 | 0.001 | |
k | 2.706 | 3.841 | 6.635 | 7.879 | 10.828 |
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解题方法
6 . 已知
分别是椭圆
的左、右焦点,
是椭圆
上的一点,且
,则椭圆
的离心率是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a2c39732beed1dbcede283901b55c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d37df44b0cc7b9cd04099b09271d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 已知虚数
满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882bff376e1d71865bd23b747ef78a66.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d5bcb101fa36ff2d9ab5e16345ba9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882bff376e1d71865bd23b747ef78a66.png)
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解题方法
8 . 已知向量
的夹角为
,且
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3391576038a1782ce7283ddb46e6ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a35ae9ce2be6d13a97d79d79b0ca219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 已知变量
与
的回归直线方程为
,变量
与
负相关,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e84801c624273c969392f5f45c7646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
A.![]() ![]() ![]() ![]() | B.![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() | D.![]() ![]() ![]() ![]() |
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名校
10 . 下列命题中正确的是( )
A.![]() ![]() |
B.终边在直线![]() ![]() ![]() |
C.若![]() ![]() |
D.第一象限角是锐角 |
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