若关于x的不等式
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的正整数解只有4个,则m的取值范围是
.
考点分析:
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若max{S
1,S
2,…,S
n}表示实数S
1,S
2,…,S
n中的最大者.设A=(a
1,a
2,a
3),b=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850009_ST/0.png)
,记A⊗B=max{a
1b
1,a
2b
2,a
3b
3},设A=(x-1,x+1,1),
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850009_ST/1.png)
,若A⊗B=x-1,则x的取值范围为( )
A.
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850009_ST/3.png)
C.
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D.
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如图,抛物线y=x
2-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850008_ST/0.png)
x-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850008_ST/1.png)
与直线y=x-2交于A、B两点(点A在点B的左侧),动点P从A点出发,先到达抛物线的对称轴上的某点E,再到达x轴上的某点F,最后运动到点B.若使点P运动的总路径最短,则点P运动的总路径的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850008_ST/images2.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850008_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850008_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850008_ST/4.png)
D.
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如图,在▱ABCD中,E为CD上一点,DE:CE=2:3,连接AE、BE、BD,且AE、BD交于点F,则S
△DEF:S
△EBF:S
△ABF=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850007_ST/images0.png)
A.4:10:25
B.4:9:25
C.2:3:5
D.2:5:25
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已知4个数据:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850006_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850006_ST/1.png)
,a,b,其中a、b是方程x
2-2x-1=0的两个根,则这4个数据的中位数是( )
A.1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750060085051/SYS201310221647500600850006_ST/2.png)
C.2
D.
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