Выбериправильный алгоритм сложения.

\(17 + 20 =\)

• \(=(8 + 10) \times 2 + 1 = (4 + 5) \times 2 \times 2 + 1 = (4 + 5) \times 2 \times 2 + 1 = (1 + 1) \times 2 \times 2 \times 2 \times 2 + 1\)
• \(=(9 + 10) \times 2 + 1 = ((4 + 5) \times 2 + 1) \times 2 + 1 = (((1 + 1) \times 2 \times 2 + 1) \times 2 + 1) \times 2 + 1 = (((2 + 2) \times 2 + 1) \times 2 + 1) \times 2 + 1\)
• \(=(8 + 10) \times 2 + 1 = ((2 + 2) \times 2 + 1) \times 2 \times 2 + 1 = (4 + 5) \times 2 \times 2 + 1 = ((1 + 1) \times 2 \times 2 + 1) \times 2 \times 2 + 1\)
• \(=(8 + 10) \times 2 + 1 = (4 + 5) \times 2 \times 2 + 1 = ((4 + 5) \times 2 + 1) \times 2 + 1 = (((1 + 1) \times 2 \times 2 + 1) \times 2 + 1) \times 2 + 1\)