a) 50 + 40 : 30 × 50 - 100 = 50 + (40 : 30) × 50 - 100 = 50 + (4/3) × 50 - 100 = 50 + (200/3) - 100 = (150 + 200 - 300)/3 = 50/3 = 16 2/3
Ответ: 16 2/3
б) 30 + 70 : 10 × 15 - 150 = 30 + 7 × 15 - 150 = 30 + 105 - 150 = 135 - 150 = -15
Ответ: -15
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
Ответ: 76 1/6
г) 100 - 80 : 4 × 14 - 67 = 100 - 20 × 14 - 67 = 100 - 280 - 67 = 100 - 347 = -247
Ответ: -247