a) $$48156 : 6 \cdot 50 - (319255 + 392210 : 7)$$
1) $$392210 : 7 = 56030$$
2) $$319255 + 56030 = 375285$$
3) $$48156 : 6 = 8026$$
4) $$8026 \cdot 50 = 401300$$
5) $$401300 - 375285 = 26015$$
Ответ: 26015
б) $$290070 - (5026 + 2018400 : 400) \cdot 8$$
1) $$2018400 : 400 = 5046$$
2) $$5026 + 5046 = 10072$$
3) $$10072 \cdot 8 = 80576$$
4) $$290070 - 80576 = 209494$$
Ответ: 209494