699 + 24 = (700 - 1) + 24 = 700 + (24 - 1) = 700 + 23 = 723786 + 35 = (800 - 14) + 35 = 800 + (35 - 14) = 800 + 21 = 8213991 + 674 = (4000 - 9) + 674 = 4000 + (674 - 9) = 4000 + 665 = 4665598 + 1393 = (600 - 2) + 1393 = 600 + (1393 - 2) = 600 + 1391 = 1991
Ответ: 723, 821, 4665, 1991.
699 + 24 = (700 - 1) + 24 = 700 + (24 - 1) = 700 + 23 = 723
786 + 35 = (800 - 14) + 35 = 800 + (35 - 14) = 800 + 21 = 821
3991 + 674 = (4000 - 9) + 674 = 4000 + (674 - 9) = 4000 + 665 = 4665
598 + 1393 = (600 - 2) + 1393 = 600 + (1393 - 2) = 600 + 1391 = 1991
Ответ: 723, 821, 4665, 1991.