Calculer une fraction NIV 5eme ex 16 19 20 ❤️

exercice 16
1/
25 = 5x5
10 = 5x2

2/
25/7 x3/10 = 5x5/7  x 3 /5x2 = 15/14

exercice 19

tu t aperçois qu'ils ont tous le meme denominateur donc il s agit de fraction simple et le calcul n est pas compliquer non plus
donc

89/5 +14/5 = 93/5

41/23-35/23 = 6/23

32/7-17/7 = 15/7

53/11+37/11 = 90/11

exercice 20

3/4+7/4 = 10/4 = 5x2 / 2x2 = 5/2

7/15-2/15 = 5/15 =5/5x3 = 1/3

25/12+11/12 = 36/12 = 12x3/12 = 3

51/8-17/8 = 34/8 = 17x2/ 2x4 = 17/4