高一数学对数函数一课一练2.doc.doc

文档介绍：对数函数????? 1 ? ?? f(x )= (1+ a x) 2a x???A ???? B ????????? C ???? D ??????? 2?)1( log )1(nn nn????= ??A?1B?-1C?2D?-2 3 ? ? log xy= -1 ? ?????????4 ??? f(x )= log a (2- ax) ???[0? 1] ????????? a ???????? A?? 0? 1? B?? 1? 2? C?? 0? 2? D?? 2?+∞? 5 ? ?????????????A ?? a?1 ?? xay??xy a log ??????????? B ??? xy3??xy 3 log ??????? xy??? C? 2 log xy a??xy a log 2??????? D ?? 10,10?????nma ????? 0 log log ??nm aa 6 ??)0(2) (log 2?xxf x??? f?3 ??????A? 128 B? 256 C? 512 D? 8 7 ? ??)20 lg( 2xxy??? ?????A? y? 0B? y? RC? y? 0? y≠1D? y≤2 ????? 8 ??? y=)23( log 22 1??xx ?????? K s5u 9???????? y=a x?[-1 ? 1] ???????????? 83 ???? a ??? 10 ???)3( log )1(xy x????????________ 11?axxay lg42) (lg 2???????? 3 ?? a=________ 12???)} lg( ,,{ xy xyxA??},,0{yxB??? A=B ?? x=________ ? y=________ ????? 13 ??? x?1?y?1 ?? 03 log 2 log 2???xy yx ??? x 2–4y 2????? 14 ?? a?1 ???? log at +1 2 ? 12 log at ???? K s5u 15 ??? f(x )=log a 1+ x 1-x (a? 0 ?? a≠ 1