如图,在数轴上点A和点B之间的整数是
.
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如图,已知A、B两点的坐标分别为(-2,0)、(0,1),⊙C 的圆心坐标为(0,-1),半径为1.若D是⊙C上的一个动点,射线AD与y轴交于点E,则△ABE面积的最大值是( )
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A.3
B.
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C.
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D.4
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一元二次方程3x
2-x=0的解是( )
A.x=0
B.x
1=0,x
2=3
C.x
1=0,x
2=
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D.x=
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如图,在Rt△ABC中,∠ACB=90°,BC=3,AC=4,AB的垂直平分线DE交AC于E,交BC的延长线于点F,则EF的长为( )
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A.
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B.
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C.
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D.2
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对于数据:80,88,85,83,84.①这组数据的平均数是84;②这组数据的众数是85;③这组数据的中位数是84;④这组数据方差是36.下列说法中正确的有( )
A.1个
B.2个
C.3个
D.4个
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