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 已知全集6ec8aac122bd4f6e               .

 

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 集合A={(x,y)|y=a},集合B={(x,y)|y=6ec8aac122bd4f6e+1,b>0,b≠1},若集合A∩B6ec8aac122bd4f6e,则实数a的取值范围是                                                 (     )

A.(-∞,1)                 B.(-∞,1]

C.(1,+∞)                 D. [1,+∞)

 

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 设6ec8aac122bd4f6e,则正确的是             (    )

A.y3y1y2         B. y2y1y3       C. y1y2y3      D. y1y3y2

 

 

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 函数6ec8aac122bd4f6e则不等式6ec8aac122bd4f6e的解集是         (    )

6ec8aac122bd4f6e         6ec8aac122bd4f6e

6ec8aac122bd4f6e         6ec8aac122bd4f6e

 

 

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 函数y=6ec8aac122bd4f6e的图象关于                           (    )

A.原点对称     B.y轴对称    C.6ec8aac122bd4f6e轴对称       D.直线6ec8aac122bd4f6e轴对称

 

 

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