... +++++=333 1 3 1 663 1 3 1 2::abbababaabbaC4, Tính:33 1 3 1 3 1 45log3400log2 1 6log2+−=A 27log8 12 5log49log2 1 4 1 49.25 81 +=−B 5 1 25,04332 19 7 810 000 16 1 −+=−C5, ... 5 2 , 4;1y x x= − ∈ − 29, 1y x x= −[ ] 10 , 5 2 , 4;1y x x= − ∈ − 2 11 , 16 y x x= + − [ ]3 2 12 , 2 3 12 1, 3;2y x x x x= − − + ∈ − 3 2 13 , os 6cos 9cos 1y c x x x= − + − 3 14 , sin ... 3,log log 1 log logb x x x x+ = + [ ]2,log ( 4)( 2) 6c x x+ + = 2 223 1 ,log log 0 1 xd xx−+ =+4 3 1 14 3 1 1,log log log log 1 1x xex x− +=+ − 1 23 1 2,log log 0 1 xfx−...