2012·陕西宝鸡·一模
名校
1 . 已知
.下列四个条件中,使
成立的必要而不充分的条件是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360ff131c51a4ef6745538c18cec92c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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(已下线)2013届四川省射洪县射洪中学高三零诊理科数学试卷(已下线)2012届陕西省宝鸡市高三教学质量检测(三)理科数学试卷(已下线)2013届陕西省西安市第一中学高三下学期期中考试理科数学试卷2015届浙江省金华十校高三下学期高考模拟(4月)理科数学试卷2016届浙江省富阳市二中高三上学期第二次质量检测理科数学试卷2015-2016学年河北省石家庄市二中高二上期末理科数学卷江西省新余市2016-2017学年高二下学期期末质量检测数学(文)试题北京东城北京一中2017届高三上学期期中考试数学(理)试题上海市大同中学2018届高三三模考试数学试题【全国百强校】湖南省浏阳一中、醴陵一中2018-2019学年高二12月联考数学(文)试题北京师范大学附属实验中学2023届高三上学期开学测试数学试题北京市西城区第一六一中学2023届高三上学期12月阶段测试数学试题陕西省西安市曲江第一中学2020-2021学年高二上学期10月月考理科数学试题
11-12高三·江西宜春·阶段练习
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2 . 若a、b为实数,则“
”是“
”的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d532ecbdac351443ed0225139b5d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ad180756030b246dd934ecbb30b64f.png)
A.充分而不必要条件 | B.必要而不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
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2012·四川遂宁·一模
3 . 记
为不超过实数
的最大整数,例如,
,
,
.设
为正整数,数列
满足
,
,现有下列命题:
①当
时,数列
的前3项依次为5,3,2;
②对数列
都存在正整数
,当
时总有
;
③当
时,
;
④对某个正整数
,若
,则
.
其中的真命题有____________ .(写出所有真命题的编号
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/5b925d162bfc4a318451bad1de9ad8ad.png?resizew=23)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/ee1f89affe794fe28a117f4609b51d9c.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/28f3976fd0e74dcfa740282a0c341bd7.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/585434c31b274a3eb49fe551eb7c110e.png?resizew=54)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/31e2bd027744455983d7ad6b2278f8a7.png?resizew=74)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/4e4e78553d03415abc2b93bc28c798f1.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/3b4928d316ef4eabb5ddb44b63baadf0.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/c6f6a6dbfd564709871981504d79e9cf.png?resizew=42)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/afe2d5da14fa41dab475e950ae7ea768.png?resizew=166)
①当
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/6f139028b0714464a79f09f063c0e4e6.png?resizew=38)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/3b4928d316ef4eabb5ddb44b63baadf0.png?resizew=31)
②对数列
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/3b4928d316ef4eabb5ddb44b63baadf0.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/aa0c1e923f4c4bfca41504586d7ee39c.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/a6fd903d4ae44420b56481433e5ec9d8.png?resizew=38)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/697f7157508e423aa3561faa6f5f93cc.png?resizew=49)
③当
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/7010e667bfab43bdac2789b62e01af81.png?resizew=34)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/7f4c55d91a4f47b78d47b0509492088c.png?resizew=75)
④对某个正整数
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/aa0c1e923f4c4bfca41504586d7ee39c.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/307fd8cee4404a6da51acfd596455ca2.png?resizew=58)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1571014031548416/1571014037094400/STEM/3a599da3f566443f9ef3dd04bcd68a02.png?resizew=66)
其中的真命题有
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2012·四川遂宁·一模
名校
解题方法
4 . 设集合
,集合
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e65bbc9e970a0b264b791ac20408954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e06bccbf2db11d1ea9a34e3f2725ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10-11高三·福建漳州·阶段练习
解题方法
5 . 已知命题
函数
在定义域上单调递增;命题
不等式
对任意实数
恒成立.若
是真命题,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569675dd7b2aca2732324f4bea5c02e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab34c84eec5f58f979279550aafe9bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347761783913374a6db9f9308c475c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44c26fdf6f5a3a0edd0e07bf3634534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6889a62cf63782524ce5f4fb489bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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