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给出下列六个命题: ① ②若f'(x)=0,则函数y=f(x)在x=x取得极值;...
给出下列六个命题:
①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/0.png)
②若f'(x
)=0,则函数y=f(x)在x=x
取得极值;
③“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/1.png)
”的否定是:“∀x∈R,均有e
x≥0”;
④已知点G是△ABC的重心,过G作直线与AB,AC两边分别交于M,N两点,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/3.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/4.png)
;
⑤已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/5.png)
点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/6.png)
到直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/7.png)
的距离为1;
⑥若|x+3|+|x-1|≤a
2-3a,对任意的实数x恒成立,则实数a≤-1,或a≥4;
其中真命题是
(把你认为真命题序号都填在横线上)
考点分析:
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