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设函数,若f(x)的值域为R,则常数a的取值范围是( ) A.(-∞,-1]∪[...
设函数
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,若f(x)的值域为R,则常数a的取值范围是( )
A.(-∞,-1]∪[2,+∞)
B.B[-1,2]
C.(-∞,-2]∪[1,+∞)
D.[-2,1]
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