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已知等比数列{an}的前三项依次为a-1,a+1,a+4,则公比为 .
已知等比数列{an}的前三项依次为a-1,a+1,a+4,则公比为 .
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已知函数
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,函数
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-2a+2(a>0),若存在x
1、x
2∈[0,1],使得f(x
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A.
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B.
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C.
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D.
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如图中,有一个是函数f(x)=
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x
3+ax
2+(a
2-1)x+1(a∈R,a≠0)的导函数f′(x)的图象,则f(-1)=( )
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A.
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B.-
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C.
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D.-
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或
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将函数
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的图象向左平移m(m>0)个单位后所得的图象关于y轴对称,则m的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942018489221/SYS201311012309420184892007_ST/1.png)
B.
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C.
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D.
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、
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,满足
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•
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=0且3
2=
2,则
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与
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-
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的夹角为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942018489221/SYS201311012309420184892006_ST/9.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942018489221/SYS201311012309420184892006_ST/10.png)
C.
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D.
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已知圆M:x
2+y
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+
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=1的左焦点为F(-c,0),若垂直于x轴且经过F点的直线l与圆M相切,则椭圆C的离心率为( )
A.
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B.
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C.
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D.
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