4. Найдите значение числового выражения: 1) -(2/3) + (-3/4) - (-11/12) + (-30/36) = 2) -(1/3) + (-4/6) + (-11/18) + (-42/36) =

1) -(2/3) + (-3/4) - (-11/12) + (-30/36) = -(2/3) - (3/4) + (11/12) - (5/6) = -(8/12) - (9/12) + (11/12) - (10/12) = (-8 - 9 + 11 - 10)/12 = -16/12 = -4/3 = -1(1/3) 2) -(1/3) + (-4/6) + (-11/18) + (-42/36) = -(1/3) - (2/3) - (11/18) - (7/6) = -1 - (11/18) - (21/18) = -1 - (32/18) = -1 - (16/9) = -(9/9) - (16/9) = -25/9 = -2(7/9) Ответ: 1) -1(1/3) или -4/3 2) -2(7/9) или -25/9