1. Выполни сложение. (70+20) + (3+6) = (40+50) + (4+2) = (70+10) + (5+1) = (20+50) + (7+2) = (60+30) + (4+5) = (80+10) + (2+3) = (10+40) + (6+1) = (50+30) + (5+3) =

Решение:

1. \( (70+20)+(3+6) = 90 + 9 = 99 \)
2. \( (40+50)+(4+2) = 90 + 6 = 96 \)
3. \( (70+10)+(5+1) = 80 + 6 = 86 \)
4. \( (20+50)+(7+2) = 70 + 9 = 79 \)
5. \( (60+30)+(4+5) = 90 + 9 = 99 \)
6. \( (80+10)+(2+3) = 90 + 5 = 95 \)
7. \( (10+40)+(6+1) = 50 + 7 = 57 \)
8. \( (50+30)+(5+3) = 80 + 8 = 88 \)

Ответ: 99, 96, 86, 79, 99, 95, 57, 88.