如图,在△ABC中,DE∥BC,AD=3,BD=6,AE=4,则EC的长是______.
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函数
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的自变量x的取值范围是
.
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如图,正方形ABCD的边长为2,动点P从C出发,在正方形的边上沿着C⇒B⇒A的方向运动(点P与A不重合).设P的运动路程为x,则下列图象中△ADP的面积y关于x的函数关系( )
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C.
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D.
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桌面上有三张背面相同的卡片,正面分别写有数字1、2、3.先将卡片背面朝上洗匀,然后从中同时抽取两张,则抽到的两张卡片上的数字之积为奇数的概率是( )
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B.
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D.
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如图,已知圆锥侧面展开图的扇形面积为65πcm
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D.1,5
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