... a, 215 + -( -3 8) - (-5 8) – 15a, 215 + -( -3 8) - (-5 8) – 15 b, 231 + 26 (- 209 + 26) b, 231 + 26 (- 209 + 26) c, 5 . ( -3 ) 2 - 14 ( -8 ) + ( -4 0)c, 5 . ( -3 ) 2 - 14 ( -8 ) + ( -4 0) Phßng ... - 5a = - 5 Bµi 144 Bµi 144 a, x = -7 ; -6 ;-5 ;-4 ; ; 6 ; 7 .a, x = -7 ; -6 ;-5 ;-4 ; ; 6 ; 7 .Tæng = ( - 7) + ( - 6 ) + …+ 6 + 7Tæng = ( - 7) + ( - 6 ) + …+ 6 + 7= = [[ (- ... biÕta, 2x -3 5 = 15a, 2x -3 5 = 152x = 502x = 50x = 25x = 25b, x = - 5b, x = - 5c, x = -1 c, x = -1 d, 4x - (-7 ) = 27d, 4x - (-7 ) = 274x = 27 - 74x = 27 - 74x = 204x...