1 . 若
,且
,则下列不等式成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b21208364124b5c477b2ff8df1c2e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45900deae0489e87fe448948e8091c4.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 已知函数
,
.
(1)证明:
;
(2)根据(1)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360a747d3a9c79e4acc5a167574d451e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dbb416ec1ff1984a724a4f48bf692.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42429a1c0a86aeb8b4786bac39940b6.png)
(2)根据(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3ff546a0e791d5cd8e4192f00e059b.png)
您最近一年使用:0次
解题方法
3 . 已知函数
.
(1)当
时,证明:
;
(2)证明不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd68e1aabcfd4a155d9bd68ff48352c.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab42740d8f095b5f7825d14c4c312096.png)
(2)证明不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1d765949bb48a6129bc42696c2c15f.png)
您最近一年使用:0次
4 . 设命题
:“若
,则
”,命题
:“若
,则
”,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00c1fc049a87888752174ddea4187c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96144368b1b5ca55648a797580f022e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb54b1b3617ebc502cb44194cbcd1dc.png)
A.“![]() |
B.“![]() |
C.“![]() |
D.以上都不对 |
您最近一年使用:0次
5 . “
且
”是“
与
均为负数的”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f525605a290beb4baf032444d40d60d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d527ffeebe6d42b6bde8a52d5a2ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.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.既不充分又不必要条件 |
您最近一年使用:0次
2014·山东烟台·一模
6 . 在实数集R中,我们定义的大小关系“>”为全体实数排了一个“序”.类似的,我们在平面向量集
上也可以定义一个称“序”的关系,记为“
”.定义如下:对于任意两个向量
,“
”当且仅当“
”或“
”.按上述定义的关系“
”,给出如下四个命题:
①若
,则
;
②若
,则
;
③若
,则对于任意
;
④对于任意向量
,若
,则
.
其中真命题的序号为__________
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/b821ac9dec7c462690443f2689fd0714.png?resizew=197)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/e90d06b43a9e46168ef27dd4becc9431.png?resizew=23)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/f916bc67006b4363aa0a80e96332be4b.png?resizew=141)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/bdc2d747122f4922a1647360d5785d35.png?resizew=57)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/cba9f8379e5847df96258aa61d04cbdd.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/c4c5198f1bc747c6ba30deb1173a36d9.png?resizew=103)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/e90d06b43a9e46168ef27dd4becc9431.png?resizew=23)
①若
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/59e54485217243c3b1d4b71d613c91fe.png?resizew=188)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/39cf3b07dc1d4e34a12a19a65f34e4f9.png?resizew=89)
②若
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/39ab310b2c144548bf6c3511de96ae5a.png?resizew=117)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/8ed74189b2bb416c8a5b4ae6180c2848.png?resizew=57)
③若
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/bdc2d747122f4922a1647360d5785d35.png?resizew=57)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/2f62aaa944cb454b962fa7a807198802.png?resizew=143)
④对于任意向量
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/9f57304acdcb4cbda68bfbbaedfa424d.png?resizew=108)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/bdc2d747122f4922a1647360d5785d35.png?resizew=57)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572081100144640/1572081106124800/STEM/9bde109d5d82430d9e198047d0581151.png?resizew=80)
其中真命题的序号为
您最近一年使用:0次
2016-12-03更新
|
915次组卷
|
3卷引用:2014届山东省烟台市高三统一质量检测考试理科数学试卷
名校
7 . 已知
、
是实数,则“
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e1a152993d5ee05bd54cfbb84d6820d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb54b1b3617ebc502cb44194cbcd1dc.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 |
您最近一年使用:0次
2016-12-03更新
|
389次组卷
|
2卷引用:2015届湖北省武汉市高中毕业生二月调研测试文科数学试卷