Составь схемы и найди значения произведений:
18 * 5
9 * 52
75 * 8
7 * 94
18 * 5 = (10 + 8) * 5 = 10 * 5 + 8 * 5 = 50 + 40 = 90
9 * 52 = (50 + 2) * 9 = 50 * 9 + 2 * 9 = 450 + 18 = 468
75 * 8 = (70 + 5) * 8 = 70 * 8 + 5 * 8 = 560 + 40 = 600
7 * 94 = (90 + 4) * 7 = 90 * 7 + 4 * 7 = 630 + 28 = 658