分解因式:2x3y-8xy3= .
考点分析:
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函数y=
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的自变量x的取值范围是
.
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如图,一只蚂蚁从O点出发,沿着扇形OAB的边缘匀速爬行一周,设蚂蚁的运动时间为t,蚂蚁到O点的距离为S,则S关于t的函数图象大致为( )
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A.
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B.
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C.
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D.
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如图,已知⊙O的半径为1,∠BOC是⊙O中的圆心角,△ABC是⊙O内接三角形,DE是三角形的中位线,则与sinA的值相等的线段是( )
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A.DE
B.EC
C.BD
D.BC
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如图,将含30°角的直角三角尺ABC绕点B顺时针旋转150°后得到△EBD,连接CD.若AB=4cm.则△BCD的面积为( )
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A.4
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B.2
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一个圆锥的底面半径长为4cm,母线长为5cm,则圆锥的侧面积为( )
A.20cm
2B.40cm
2C.20πcm
2D.40πcm
2
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