ПОМОГИТЕ!! ДАЮ 50 баллов!!!!!!!!!!!! Уравнение!

(1/9 + 7/18 -11/27 - 5/18)z = 5/2 (3/27 + 3/27 - 11/27)z = 5/2 -5/27 * z = 5/2 z = -(5/2):(5/27) z = -(5/2)*(27/5) z = -27/2 = -13.5 2) (1 - 11/18 + 7/18 - 23/18)a = 1/3 (18/18 - 27/18)a = 1/3 -1/2 * a = 1/3 a = -(1/3):(1/2) a = -(1/3)*2 = -2/3

1/9z + 7/18z - 11/27z = 2 1/2 + 5/18z 6/54z + 21/54z - 22/54z - 15/54z = 5/2 - 10/54z = 5/2  z = 5/2 : (-10/54z)  z = - 27/2  z = - 13 1/2 ---------------------------------------------------- a - 11/18a = 1/3 - 7/18a +1 5/18a a - 11/18a + 7/18a - 23/18a = 1/3 - 1/2a = 1/3    a = - (1/3 : 1/2)    a = - 2/3