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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