5 примеров по распределительному закону

1. 57 * 5 = (50 + 7) * 5 = 50 * 5 + 7 * 5 = 250 + 35 = 285;
2. 23 * 8 = (20  + 3) * 8 = 20 * 8 + 3 * 8 = 160 + 24 = 184;
3. 122 * 7 = (100 + 20 + 2) * 7 = 100 * 7 + 20 * 7 + 2 * 7 = 700 + 140 + 14 = 854;
4. 41 * 3 = (40 + 1) * 3 = 40 * 3 + 1 * 3 = 120 + 3 = 123;
5. 205 * 4 = (200 + 5) * 4 = 200 * 4 + 5 * 4 = 800 + 20 = 820