70 ⋅ 8 – 56 : (235 678 – 235 670) ⋅ 70 + 561 =

Решение:

1. $$235678-235670 = 8$$
2. $$70 \cdot 8 = 560$$
3. $$56 : 8 = 7$$
4. $$7 \cdot 70 = 490$$
5. $$560 - 490 = 70$$
6. $$70 + 561 = 631$$

Ответ: 631