... ACBAB\= . Baứi 1. Vit mi tp hp sau bng cỏch lit kờ cỏc phn t ca nú: A = {}xRxxxx22(253)(43)0 -+ -+ = B = {}xRxxxx23 (10 2 1) ()0 -+ -= C = {}xRxxxx22(6 71) (56)0 -+ -+ = D = {}xZxx22530 -+ = ... {2, 4, 7, 8, 9, 12 }, B = {2, 8, 9, 12 } b) A = {2, 4, 6, 9}, B = {1, 2, 3, 4} c) A = {}xRxx22 310 -+ =, B = {}xRx 211 -= . d) A = Tp cỏc c s ca 12 , B = Tp cỏc c s ca 18 . e) A = {}xRxxxx2 (1) (2)( 815 )0ẻ+ ... cho cỏc phn t ca nú: A = {}0; 1; 2; 3; 4 B = {}0; 4; 8; 12 ;16 C = {}3 ; 9; 27; 81 D = {}9; 36; 81; 14 4 E = {}2,3,5,7 ,11 F = {}3,6,9 ,12 ,15 E = Tp tt c cỏc im thuc ng...