bonjour qui pourrait m’aider pr l’exercice 11 merci !! ( Additionner soustraire 2 fractions)

Réponse:

11) A = 11/4

B = 18/5

C = 55/9

D = 11/3

E = 25/4

F = -3/13

Explications étape par étape:

11) A = 1 + 7/4

= (1×4/1×4) + 7/4

= 4/4 + 7/4

= (4+7)/4

= 11/4

B = 3 + 3/5

= (3×5/1×5) + 3/5

= 15/5 + 3/5

= (15+3)/5

= 18/5

C = 10/9 + 5

= 10/9 + (5×9/1×9)

= 10/9 + 45/9

= (10+45)/9

= 55/9

D = 20/3 - 3

= 20/3 - (3×3/1×3)

= 20/3 - 9/3

= (20-9)/3

= 11/3

E = 7 - 3/4

= (7×4/1×4) - 3/4

= 28/4 - 3/4

= (28-3)/4

= 25/4

F = 23/13 - 2

= 23/13 - (2×13/1×13)

= 23/13 - 26/13

= (23-26)/13

= -3/13