2.213 Вычислите. a) 50 + 40 : 30 - 50 - 100 = ? б) 30 + 70 : 10 - 15 - 150 = ? в) 100 - 70 : 3 - 18 : 36 = ? г) 100 – 80 :4 - 14 - 67 = ?

a) 50 + 40 : 30 - 50 - 100 = ? 50 + (40 : 30) - 50 - 100 = 50 + (4/3) - 50 - 100 = (150 + 4 - 150 - 300) / 3 = (154 - 450) / 3 = -296/3 = -98,(6) б) 30 + 70 : 10 - 15 - 150 = ? 30 + (70 : 10) - 15 - 150 = 30 + 7 - 15 - 150 = 37 - 165 = -128 в) 100 - 70 : 3 - 18 : 36 = ? 100 - (70 : 3) - (18 : 36) = 100 - (70/3) - (1/2) = (600 - 140 - 3) / 6 = 457/6 = 76,1(6) г) 100 – 80 :4 - 14 - 67 = ? 100 - (80 : 4) - 14 - 67 = 100 - 20 - 14 - 67 = 80 - 81 = -1