Sagot :
Bonjour
a. 5/6 + 7/18
= (5 x 3) / (6 x 3) + 7/18
= 15/18 + 7/18
= 22/18
= (2 x 11) / (2 x 9)
= 11/9
b. 7/3 - 1/12
= (7 x 4) / (3 x 4) - 1/12
= 28/12 - 1/12
= 27/12
= (3 x 9) / (3 x 4)
= 9/4
c. 11/20 + 3/4
= 11/20 + (3 x 5) / (4 x 5)
= 11/20 + 15/20
= 26/20
= (2 x 13) / (2 x 10)
= 13/10
d. 23/18 - 8/18 = 15/18 = (3 x 5) / (3 x 6) = 5/6.
Explications étape par étape:
Voici les réponses. j'espere que ça t'aider