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抛物线y=x2-2x-3的顶点坐标是( ) A.(-1,-4) B.(3,0) ...
抛物线y=x2-2x-3的顶点坐标是( )
A.(-1,-4)
B.(3,0)
C.(2,-3)
D.(1,-4)
考点分析:
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如图,一次函数y
1=kx+b与二次函数y
2=ax
2交于A(-1,1)和B(2,4)两点,则当y
1<y
2的取值范围是( )
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A.x<-1
B.x>2
C.-1<x<2
D.x<-1或x>2
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抛物线y=ax
2+bx+c与直线y=ax+b的大致图象只可能是( )
A.
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B.
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C.
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D.
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二次函数y=2(x+2)
2-1的图象是( )
A.
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B.
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C.
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D.
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函数y=ax
2-2x+1和y=ax+a(a是常数,且a≠0)在同一直角坐标系中的图象可能是( )
A.
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B.
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C.
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D.
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在同一坐标系中,作出函数y=kx
2和y=kx-2(k≠0)的图象,只可能是( )
A.
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B.
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C.
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D.
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