... 2 2 2 219 2 33x xx x−− − ≤ ÷ 4, 3 1 2 2 7 .2 7 .2 2 0x x x+− + − = 2, 2 1 2 13 2 5.6 0x x x+ +− − ≤ 5, 2 2 2 4 2 2 1 2 16 .2 201x x x xx− − − −− −≤+3, 2 35 2 12 2 ... +− +7, 2 2 2 3 4 64 4 12 3xy x yx y x y+ + = −+ + + = 15, ( )( )( ) 2 2 2 2 2 236 25 6036 25 6036 25 60y x xz y yx z z+ =+ =+ =8, 2 2 2 2 2 3( ),7( ... 35 2 12 2 1xxx+ >− 6, 2 21 1 1 2 2 2 2x x x x+ − − −+ ≤ +Bài 8. Giải các bất phương trình logarit:1, ( )1log 2 2xx+− > 4, ( ) 2 21 2 21 1log 2 3 1 log 1 2 2x x...