Odpowiedź:
5/18 ×3 = 5/18 × 3/1= 5/6
7 × 10/33 = 5/1 × 10/33 = 70/33 = 2 4/33
11 × 1/8 = 11/1 × 1/8 = 11/8 = 1 3/8
5/8 ×3 = 5/8 × 3/1 = 15/8 = 1 7/8
9/20 × 9 = 9/20 × 9/1 = 81/20 = 4 1/20
5 × 6/13= 5/1 × 6/13 = 30 /13 = 2 4/13
4 × 3/5 = 4/1 × 3/5 = 12/5 = 2 2/5
3 × 2/9 = 3/1 × 2/9 = 2/3