5. Выполни сложение: (74 + 6) + 7; (27 + 3) + 5; (55 + 5) + 8; (32 + 8) + 4; (46 + 4) + 2; (61 + 9) + 6; (83 + 7) + 9; (38 + 2) + 3.

1. \((74 + 6) + 7 = 80 + 7 = 87\)
2. \((27 + 3) + 5 = 30 + 5 = 35\)
3. \((55 + 5) + 8 = 60 + 8 = 68\)
4. \((32 + 8) + 4 = 40 + 4 = 44\)
5. \((46 + 4) + 2 = 50 + 2 = 52\)
6. \((61 + 9) + 6 = 70 + 6 = 76\)
7. \((83 + 7) + 9 = 90 + 9 = 99\)
8. \((38 + 2) + 3 = 40 + 3 = 43\)

Ответ: 87; 35; 68; 44; 52; 76; 99; 43.