(2010•内江)化简:
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(2010•内江)在一次演讲比赛中,某选手的得分情况如下:87、91、91、93、87、89、96、97,这组数据的中位数是
.
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(2010•内江)如图,梯形ABCD中,AD∥BC,点E在BC上,AE=BE,点F是CD的中点,且AF⊥AB,若AD=2.7,AF=4,AB=6,则CE的长为( )
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A.
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B.
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C.2.5
D.2.3
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(2010•内江)如图,反比例函数
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的图象经过矩形OABC对角线的交点M,分别与AB、BC相交于点D、E.若四边形ODBE的面积为6,则k的值为( )
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A.1
B.2
C.3
D.4
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(2010•内江)在四张完全相同的卡片上分别印有等边三角形、平行四边形、等腰梯形、圆的图案,现将印有图案的一面朝下,混合后从中一次性随机抽取两张,则抽到的卡片上印有的图案都是轴对称图形的概率为( )
A.
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B.
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C.
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D.
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