a) 13 + 21 + 87 + 55 - 29 - 7 - 46 + 14 = 190 - 82 = 108;
б) 4 × 9 × 5 × 2 × 25 = 100 × 9 × 5 × 2 = 100 × 9 × 10 = 1000 × 9 = 9000.
a) 13 + 21 + 87 + 55 - 29 - 7 - 46 + 14 = 190 - 82 = 108;
б) 4 × 9 × 5 × 2 × 25 = 100 × 9 × 5 × 2 = 100 × 9 × 10 = 1000 × 9 = 9000.