Réponse:
5/6 + 5/12
= 10/12 + 5/12
= 15/12
= 5/4
13/14 + 5/7
= 13/14 + 10/14
= 23/14
19/99 - 1/11
= 19/99 - 9/99
= 10/99
2 + 3/4 + 7/2
= 8/4 + 3/4 + 14/4
= 25/4
3/8 × 32
= 3 × 4. On simplifie par 8.
= 12
45/14 × 49/60
= 2205/840
= 21/8. On simplifie par 105.
45/26 × 65/72
= 2925/1872
= 25/16. On simplifie par 117.
6 × 1/88 × 11/12
= 6 × 1/8 × 1/12
= 6/8 × 1/12
= 3/4 × 1/12
= 3/48
