Вычисли и выполни проверку.
27 + 36;
84 − 59;
32 * 3;
96 : 6.
27 + 36 = (20 + 7) + (30 + 6) = (20 + 30) + (7 + 6) = 50 + 13 = 63
Проверка:
63 − 36 = 63 − (30 + 6) = (63 − 30) − 6 = 33 − 6 = 27
84 − 59 = 84 − (50 + 9) = (84 − 50) − 9 = 34 − 9 = 25
Проверка:
25 + 59 = (20 + 5) + (50 + 9) = (20 + 50) + (5 + 9) = 70 + 14 = 84
32 * 3 = (30 + 2) * 3 = 30 * 3 + 2 * 3 = 90 + 6 = 96
Проверка:
96 : 3 = (90 + 6) : 3 = 90 : 3 + 6 : 3 = 30 + 2 = 32
96 : 6 = (60 + 36) : 6 = 60 : 6 + 36 : 6 = 10 + 6 = 16
Проверка:
16 * 6 = (10 + 6) * 6 = 10 * 6 + 6 * 6 = 60 + 36 = 96