1 . 下列有关命题的说法正确的是
A.命题“若![]() ![]() ![]() ![]() |
B.若![]() ![]() |
C.命题“存在![]() ![]() ![]() ![]() |
D.命题“若![]() ![]() |
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13-14高三上·四川眉山·阶段练习
2 . 对于以下判断:
(1)命题“已知
”,若x
2或y
3,则x+y
5”是真命题.
(2)设f(x)的导函数为f'(x),若f'(x0)=0,则x0是函数f(x)的极值点.
(3)命题“
,ex﹥0”的否定是:“
,ex﹥0”.
(4)对于函数f(x),g(x),f(x)
g(x)恒成立的一个充分不必要的条件是f(x)min
g(x)max.
其中正确判断的个数是
(1)命题“已知
![](https://img.xkw.com/dksih/QBM/2014/2/14/1571509205221376/1571509210324992/STEM/b2ddd308b69d403cae22814cbf20655a.png)
![](https://img.xkw.com/dksih/QBM/2014/2/14/1571509205221376/1571509210324992/STEM/fd677740f7204520a1ffca73178050bc.png)
![](https://img.xkw.com/dksih/QBM/2014/2/14/1571509205221376/1571509210324992/STEM/fd677740f7204520a1ffca73178050bc.png)
![](https://img.xkw.com/dksih/QBM/2014/2/14/1571509205221376/1571509210324992/STEM/fd677740f7204520a1ffca73178050bc.png)
(2)设f(x)的导函数为f'(x),若f'(x0)=0,则x0是函数f(x)的极值点.
(3)命题“
![](https://img.xkw.com/dksih/QBM/2014/2/14/1571509205221376/1571509210324992/STEM/666050d6fa164b389e1b476c46d294f0.png)
![](https://img.xkw.com/dksih/QBM/2014/2/14/1571509205221376/1571509210324992/STEM/4620175de6c44db6bc2809db29206c1b.png)
(4)对于函数f(x),g(x),f(x)
![](https://img.xkw.com/dksih/QBM/2014/2/14/1571509205221376/1571509210324992/STEM/e1b34d971e1947c5a4c084c292fb3da2.png)
![](https://img.xkw.com/dksih/QBM/2014/2/14/1571509205221376/1571509210324992/STEM/e1b34d971e1947c5a4c084c292fb3da2.png)
其中正确判断的个数是
A.1 | B.2 | C.3 | D.0 |
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3 . 已知两个实数
,满足
,命题
;命题
.则下面命题正确的是
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572004579082240/1572004584759296/STEM/9135991092be4ebcb736849db78c6601.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572004579082240/1572004584759296/STEM/bc2dca57cc1349b48cb20557ec590ac6.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572004579082240/1572004584759296/STEM/47558297bc234584ac04b5d228565ba9.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572004579082240/1572004584759296/STEM/1c3d18fee32d41479eff4e6bbeb4ac6c.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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