不等式组
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的解集为
.
考点分析:
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已知抛物线y=ax
2+bx+c中,4a-b=0,a-b+c>0,抛物线与x轴有两个不同的交点,且这两个交点之间的距离小于2.则下列结论:①abc<0,②c>0,③a+b+c>0,④4a>c,其中,正确结论的个数是( )
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B.3
C.2
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如下图,在平行四边形ABCD中,∠DAB=60°,AB=5,BC=3,点P从起点D出发,沿DC、CB向终点B匀速运动.设点P所走过的路程为x,点P所经过的线段与线段AD、AP所围成图形的面积为y,y随x的变化而变化.在下列图象中,能正确反映y与x的函数关系的是( )
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A.
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D.
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如图,四边形ABCD为矩形纸片,把纸片ABCD折叠,使点B恰好落在CD边的中点E处,折痕为AF,若CD=6,则AF等于( )
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B.
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C.
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A.
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