Réponse :
Explications étape par étape :
Exercice 13
A = (3/5 + 5/3) / (5 - 1/3)
= (9/15 + 25/15) / (15/3 - 1/3)
= ( 34/15) / 14/3)
= 34/15 X 3 / 14
= ( 2 X 17 X 3) / (3 X 2 X 7)
= 17 / 35
B= (9/8 - 3/4) / (11/10 -1)
= ( 9/8 - 6/8 ) / 11/10 - 10/10)
= (3/8) / (1/10)
= 3/8 X 10
= (3 X2 X5) / (2 X 4 )
= (3 X 5 ) / 4
= 15/4
