... luận các bất ph-ơng trình( 0 a 1 < ạ): 11 4. alog x 1 2x a x+> 11 5. 2aa 1 log x 1 1 log x+>+ 11 6. a a 1 2 1 5 log x 1 log x+ <- + 11 7. x a 1 log 10 0 log 10 0 02- ... xxx-+=223.368 14 . 2653 1 3 1 2+-+>xxx 15 . xx3 1 1 1 3 1 1--+ 16 . 13 1 12 1 22+-xx 17 . 255 1 2<<-xx 18 . ( )() 12 loglog5,05,022508,0---ữữứửỗỗốổxxxx ... ()4log1log1 12 -=-+xx 81. ( ) ( )8 1 log14log.44log2 /1 2 1 2=+++ xx 82. ()()222log12log 1 2 /12 -> +xx 83. ( ) ( ) 1 1 1 2525+---³+xxx 84. 0 1 2 12 2 1 £-+--xxx85....