(2013•盐城)16的平方根是 .
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(2008•濮阳)如图,已知▱ABCD中,AB=4,AD=2,E是AB边上的一动点(动点E与点A不重合,可与点B重合),设AE=x,DE的延长线交CB的延长线于点F,设CF=y,则下列图象能正确反映y与x的函数关系的是( )
A.
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B.
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C.
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D.
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(2008•濮阳)如果关于x的一元二次方程k
2x
2-(2k+1)x+1=0有两个不相等的实数根,那么k的取值范围是( )
A.k>
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B.k>
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且k≠0
C.k<
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D.k≥
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且k≠0
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(2008•濮阳)初三某班10名男同学“引体向上”的测试成绩(单位:次数)分别是:9,14,10,15,7,9,16,10,11,9,这组数据的众数,中位数,平均数依次是( )
A.9,10,11
B.10,11,9
C.9,11,10
D.10,9,11
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A.360°
B.180°
C.150°
D.120°
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A.
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B.
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C.
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D.
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