真题
1 . 已知虚数
,其实部为1,且
,则实数
为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a2f912dba0e17b3b87244e131e4b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
名校
2 . 设向量集合
.若对于任意
、
以及任意
,都有
,则称集合S是“凸集”.现有四个命题:
①集合
是“凸集”;
②集合
是“凸集”;
③若集合
、
都是“凸集”,则
也是“凸集”;
④若集合
、
都是“凸集”,且交集非空,则
也是“凸集”.
其中,所有正确命题的序号是________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a8aa6b0a40a2ef451c9f6c263662d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37c1870a8601323a0fefb2f90c669f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee72261f6901e62dfd0ffe547406544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304c5050fdb05bd5ccdf8bdfc00e8108.png)
①集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9275e06e147f70046e6c91b1cac72bfc.png)
②集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f32c01a67d79efc9fb98afc8bd2fb8.png)
③若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2646f41226f24960a6186dc7860ef45.png)
④若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b76d26b78e63683dfacf10d3da6d74d.png)
其中,所有正确命题的序号是
您最近一年使用:0次
3 . 现从甲乙口袋各摸出一个球,如果从甲口袋中摸出一个红球的概率是
,从乙口袋中摸出一个红球的概率是
,则摸出的两个球至少有1个红球的概率为_________ (请用分数表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
您最近一年使用:0次
名校
4 . 已知函数
,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea2b573ea48116f74d3381374754a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ec8154ff491ea046bd074eeb30ba01.png)
您最近一年使用:0次
名校
5 . 已知
为等差数列,
是公比为2的等比数列,且
,求集合
中元素个数__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9577321bd85f232a0fecb06639171e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db84e10c0bfea0a3357785f7cfc9a2b2.png)
您最近一年使用:0次
6 . 甲乙丙丁四名医生随机派往①②③三个村庄进行义诊活动,每个村庄至少派一名医生,
表示事件“医生甲派往①村庄”;
表示事件“医生乙派往①村庄”;
表示事件“医生乙派往②村庄”, 则下列说法①事件
与
相互独立; ②事件
与
相互独立; ③
;④
,其中错误的个数是__________ 个.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1b78ae4f84884bdc29b5a75bafd44b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e452531f7b654e16f76b0209d367e4e2.png)
您最近一年使用:0次
名校
7 . 设甲、乙两个地区爆发了某种流行病,且两个地区感染此病的比例分别为
、
,若从这两个地区中任选一个地区选择一个人,则此人感染此疾病的概率是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
您最近一年使用:0次
名校
8 . 如图,在函数
的部分图象中,若
,则点
的纵坐标为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a8855aff1b33b5849d88513101d8d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af8fac5ea40d7d2d1d3a8843f701b390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
名校
解题方法
9 . 若函数
在
上存在最小值,则实数a的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52aeb02cda2b712333f5c44cded5eb5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434ccdb0e64ad2a799ce7bcf2d6bd263.png)
您最近一年使用:0次
名校
解题方法
10 . 在n维空间中
,以单位长度为边长的“立方体”的顶点坐标可表示为n维坐标
,其中
.定义:在n维空间中两点
与
的曼哈顿距离为
在5维“立方体”的顶点中任取两个不同的顶点,记随机变量X为所取两点间的曼哈顿距离,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac87b4bd71432d757c7b78bbd6b2dcfd.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0ba2efb4674cbc52ce744836fb0e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97de4e0337716e1d89eb1a6cfd7b8335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d615ed9c667590c7ac380b77a32c207c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97de4e0337716e1d89eb1a6cfd7b8335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0957e53f35d71f1d9df9052a1ed97e5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d270a8085c569fea6df3ad8ff5eb3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac87b4bd71432d757c7b78bbd6b2dcfd.png)
您最近一年使用:0次