分解因式:xy2-x= .
考点分析:
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已知二次函数y=ax
2+bx+c(a≠0)的图象如图所示,则正比例函数y=(b+c)x的图象与反比例函数y=
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的图象在同一坐标系中大致是( )
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A.
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B.
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C.
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D.
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在平行四边形ABCD中,点E为AD的中点,连接BE,交AC于点F,则S
△AEF:S
△BCF的值是( )
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A.
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B.
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C.
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D.
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为了解某班学生每天使用零花钱的使用情况,张华随机调查了15名同学,结果如下表:
关于这15名同学每天使用的零花钱,下列说法正确的是( )
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B.平均数是2.5元
C.极差是4元
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如图,已知在Rt△ABC中,∠BAC=90°,AB=3,BC=5,若把Rt△ABC绕直线AC旋转一周,则所得圆锥的侧面积等于( )
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A.6π
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反比例函数y=
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的图象经过点(-1,2),k的值是( )
A.-
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B.
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C.-2
D.2
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