j.ai fais calcul on peux me corriger merci et maider a placer les operations ​

Réponse :

bonsoir

Explications étape par étape :

on calcule chacune les sommes de chacune des figures

7/30 + 3/10 = 7/30 + (3 x 3 )/ (3 x 10)

7/30 + 3/10 = 7/30 + 9/30

7/30 + 3/10 = 16/30 = 8/15

13/7 = 13/7 (fraction irréductible)

19/21 = 19/21 (fraction irréductible)

11/5 - 12/35 = (11 x 7)/(7 x 5) - 12/35

11/5 - 12/35 = 77/35 - 12/35

11/5 - 12/35 = 65/35 = 13/7

36/42 + 1/21 = 36/42 + (2 x 1)/(2 x 21)

36/42 + 1/21 = 36/42 + 2/42

36/42 + 1/21 = 38/42 = 19/21

4 - 10/6 = (4 x 6)/(6 x 1) - 10/6

4 - 10/6 = 24/6 - 10/6 = 14/6 = 7/3

23/15 + 8/3 = 23/15 + ( 8 x 5)/(5 x 3)

23/15 + 8/3 = 23/15 + 40/15

23/15 + 8/3 = 63/15 = 21/5

bonne soirée