1 . 不等式
的解集是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1f99d5645fdcfc651f697f4692aaae.png)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
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2 . 对于实数
有下列命题:
①若
则
;
②若
则
;
③若
,则
;
④若
则
;
⑤若
,则![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/e50b6adfeca747ac995f649b6159bb84.png?resizew=80)
其中真命题的序号是__________ .
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/62ca7e9a2ac74edd99e7d2e4c708d731.png?resizew=40)
①若
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/462c59d0698348d5bf76ef92485a44fe.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/51bf5540a05c4015980662f2bb576a06.png?resizew=52)
②若
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/6affb99b6c844ecaa68a1f228055ee04.png?resizew=67)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/462c59d0698348d5bf76ef92485a44fe.png?resizew=39)
③若
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/58ad4f4c04d14f40ac7a3f16d1b28c59.png?resizew=63)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/420eba011a49415389c54a9c353b16f0.png?resizew=85)
④若
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/2fd80eab409d46099f4fa2fa1fb4cff7.png?resizew=91)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/4bfe8a31eb6c450ea530b6b9f8283a7e.png?resizew=88)
⑤若
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/4dfd5b837486413f8dcd7c55c3530b76.png?resizew=83)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952635904/STEM/e50b6adfeca747ac995f649b6159bb84.png?resizew=80)
其中真命题的序号是
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3 . 已知
,则
取最大值时x的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca542e78b7d77d008c9c4752afa91a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce547aaa3275422ccc1d95ca6434f3e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2016-12-04更新
|
608次组卷
|
6卷引用:2015-2016学年陕西省西北农林科大附中高二上学期期中考试数学试卷
2015-2016学年陕西省西北农林科大附中高二上学期期中考试数学试卷(已下线)第一章 3.2 第1课时 基本不等式-【新教材】北师大版(2019)高中数学必修第一册练习贵州省黎平一中2021-2022学年度高一上学期第一次月考试题湖南省郴州市嘉禾县第一中学2020-2021学年高一下学期第一次月考数学试题河南省南阳市2022-2023学年高一上学期第一次月考数学试题北师大版(2019) 必修第一册 数学奇书 学业评价(十) 基本不等式
4 . 若数列
的通项公式是
,则
=
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952234496/STEM/b26a077c586a43c699fd092c482c9855.png)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952234496/STEM/8fb5b97de8cf4697a239d86b5a3c76aa.png)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952234496/STEM/a8f3e8ee54174107bf79c05e573d431d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 解关于
的不等式:
(
)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952545792/STEM/ce474b9052e74fbaacfb5587ecff0d9e.png)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952545792/STEM/032bf3627643461fa291454000828ff8.png)
![](https://img.xkw.com/dksih/QBM/2016/3/15/1572539946893312/1572539952545792/STEM/0730f8f6c0e04bb09c83b9c090b28983.png)
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6 . 若
,其中a,b都是实数,i是虚数单位,则|a+bi|=____ .
![](https://img.xkw.com/dksih/QBM/2016/3/11/1572532795990016/1572532801167360/STEM/611de766c25a4378852c72e5540dd42c.png?resizew=84)
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7 . 两个变量x,y与其线性相关系数r有下列说法,其中正确的有
①若r>0,则x增大时,y也增大;
②若r<0,则x增大时,y也增大;
③若r=1或r=﹣1,则x与y的关系完全对应(有函数关系),在散点图上各个散点都在同一条直线上;
④两个变量x,y的回归方程为y+2x+1=0,则y与x正相关.
①若r>0,则x增大时,y也增大;
②若r<0,则x增大时,y也增大;
③若r=1或r=﹣1,则x与y的关系完全对应(有函数关系),在散点图上各个散点都在同一条直线上;
④两个变量x,y的回归方程为y+2x+1=0,则y与x正相关.
A.①② | B.②③ | C.①③ | D.①②③ |
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8 .
=
![](https://img.xkw.com/dksih/QBM/2016/3/11/1572532795990016/1572532801060864/STEM/1fe35be79f5f4342be3f4f6835212a48.png)
A.﹣1 | B.1 | C.4 | D.﹣4 |
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9 . 下面是关于复数z=
的四个命题:p1:|z|=2,p2:z2=2i,p3:z的共轭复数为1+i,p4:z的虚部为﹣1.其中的真命题为_____ .
![](https://img.xkw.com/dksih/QBM/2016/3/11/1572532795990016/1572532801200128/STEM/d4ea9a9ffcbd4f3d8b2c3f874a65319c.png?resizew=42)
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10 . 甲、乙、丙三人参加某项技能测试,他们能达标的概率分别是0.8,0.5,0.6,则三人中仅有一人达标的概率是_____ .
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2016-12-04更新
|
341次组卷
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3卷引用:2014-2015学年陕西省咸阳市三原县北城中学高二下期中文科数学试卷