... 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 trung trc ca on ... {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 ẻ-+=, B = {}xRx 211 ẻ-=. d) A = Tp cỏc c s ca 12 , B = Tp cỏc c s ca 18 . e) A = {}xRxxxx2 (1) (2)( 815 )0ẻ+ ... 4) f) A = (1; 4), B = (2; 6) Baứi 10 . Tỡm A ẩ B ẩ C, A ầ B ầ C vi: a) A = [1; 4], B = (2; 6), C = (1; 2) b) A = (Ơ; 2], B = [3; +Ơ), C = (0; 4) c) A = [0; 4], B = (1; 5), C = (3; 1] d) A =...