Выполним вычисления по порядку:
- $$187 + 75 = 262$$
- $$850 - 86 = 764$$
- $$238 + 93 = 331$$
- $$540 + 30 = 570$$
- $$540 + 300 = 840$$
- $$540 + 330 = 870$$
- $$17 \cdot 4 : 2 = 68 : 2 = 34$$
- $$28 \cdot 3 : 4 = 84 : 4 = 21$$
- $$18 \cdot 5 : 3 = 90 : 3 = 30$$
- $$42 : 14 \cdot 26 = 3 \cdot 26 = 78$$
- $$60 : 12 \cdot 14 = 5 \cdot 14 = 70$$
- $$90 : 15 \cdot 13 = 6 \cdot 13 = 78$$
Ответы:
- 187 + 75 = 262
- 850 - 86 = 764
- 238 + 93 = 331
- 540 + 30 = 570
- 540 + 300 = 840
- 540 + 330 = 870
- 17 ⋅ 4 : 2 = 34
- 28 ⋅ 3 : 4 = 21
- 18 ⋅ 5 : 3 = 30
- 42 : 14 ⋅ 26 = 78
- 60 : 12 ⋅ 14 = 70
- 90 : 15 ⋅ 13 = 78