В) (11/18 - 1 7/12) * (2 1/6 + 7/30) =
= (22/36 - 1 21/36) * (2 5/30 + 7/30) =
= (22/36 - 57/36) * (2 12/30) =
= (- 35/36) * (72/30) =
= - (35 * 72) / (36 * 30) =
= - (14/6) = - (2 2/6) = - (2 1/3)
г) (3 2/5 - 5) (31/48 + 7/24) =
= (3 2/5 - 4 5/5) (31/48 + 14/48) =
= (- 1 3/5) (45/48) =
= - (8/5) (45/48) =
= - (9/6) = - (1 3/6) = - (1 1/2)