Пошаговое объяснение:
1) = 50/16 - (69/16 + 20/16) = - 39/16 = -2 7/16
2) = - 114/15 + (61/15 + 85/15) = 32/15 = 2 2/15
3) = -70/20 - (115/20 + 47/20) = -232/20 = -58/5= - 11 3/5
4) = -6/18 + (61/18 + 106/18) = 161/18 = 144 17/18
