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已知等差数列{an}的前2006项的和S2006=2008,其中所有的偶数项的和...
已知等差数列{an}的前2006项的和S2006=2008,其中所有的偶数项的和是2,则a1003的值为 .
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已知函数
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,则函数f(x)的值域为( )
A.[2,4]
B.
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C.
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D.
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直线MN与双曲线C:
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=1(a>0,b>0)的左右支分别交于M、N点,与双曲线的右准线相交于P点,F为右焦点,若|FM|=2|FN|,又
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A.
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B.2
C.
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D.3
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在平面直角坐标系中,不等式组
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(a为常数)表示的平面区域面积是9,那么实数a的值为( )
A.3
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B.-3
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+2
C.-5
D.1
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若函数
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,且0<x
1<x
2<1,设
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,则a,b的大小关系是( )
A.a>b
B.a<b
C.a=b
D.b的大小关系不能确定
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