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【单选题】
下列函数中,( x 是自变量),是二次函数的为 ( ) 1 y=a +bx+c 2 =x2-4x+1 3 y= 4 y=2+ +1A.
(1)
B.
(2)
C.
(3)
D.
(4)
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A.
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A.
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A.
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B.
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C.
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D.
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