分解因式:2x2-4x= .
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已知点A(0,0),B(0,4),C(3,t+4),D(3,t).记N(t)为▱ABCD内部(不含边界)整点的个数,其中整点是指横坐标和纵坐标都是整数的点,则N(t)所有可能的值为( )
A.6、8
B.7、8
C.6、7、8
D.6、8、9
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如图,平行四边形ABCD中,AB:BC=3:2,∠DAB=60°,E在AB上,且AE:EB=1:2,F是BC的中点,过D分别作DP⊥AF于P,DQ⊥CE于Q,则DP:DQ等于( )
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A.3:4
B.
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如图,梯形ABCD中,AD∥BC,对角线AC、BD相交于O,AD=1,BC=4,则△AOD与△BOC的面积比等于( )
A.
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B.
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D.
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B.140°
C.70°
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已知圆柱的底面半径为3cm,母线长为5cm,则圆柱的侧面积是( )
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