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抛物线y=(x-2)2+3的顶点坐标是( ) A.(-2,3) B.(2,3) ...
抛物线y=(x-2)2+3的顶点坐标是( )
A.(-2,3)
B.(2,3)
C.(-2,-3)
D.(2,-3)
考点分析:
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A.
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D.
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的解是( )
A.
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D.
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下列运算正确的是( )
A.
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=±3
B.|-3|=-3
C.-
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=-3
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的倒数为( )
A.
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B.2
C.-2
D.-1
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