抛物线y=-2x2+3x-1与y轴的交点坐标是 .
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将抛物线y=x
2+3向下平移一个单位,得到新的抛物线,那么新的抛物线的表达式是
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抛物线y=ax
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如图,在△ABC中,AB=AC=3,BC=2,点D在腰AC上,且BD=BC,那么下列结论正确的是( )
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A.AD=2
B.
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C.
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D.
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如图,已知AB∥CD∥EF,BD:DF=2:5,那么下列结论正确的是( )
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A.AC:AE=2:5
B.AB:CD=2:5
C.CD:EF=2:5
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在△ABC中,tanA=1,
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,那么△ABC是( )
A.钝角三角形
B.直角三角形
C.锐角三角形
D.等腰三角形
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