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(全国Ⅱ卷文7)设曲线在点(1,)处的切线与直线平行,则
A.1 B. C. D.
(全国Ⅰ卷文7)已知等比数列满足,则( )
A.64 B.81 C.128 D.243
(09全国2文1)已知全集U={1,2,3,4,5,6,7,8},M={1,3,5,7},N={5,6,7},则
A .{5,7} B. {2,4} C.{2,4,8} D. {1,3,5,7}