Explications étape par étape:
5/6 × 13 = (5×13)/6 = 65/6
2/9 × 21 = (2×21) / 9 = (2×3×7)/3×3 = 14/3
12/11×9 = (12×9)/11 = 108/11
5/14×12 = (5×12)/14 = (5×2×6)/2×7 = 30/7
15/26×6 = (15×6)/26 = 90/26 = 45/13
