Répondre :
bonjour
A = - 1/14 - 2 /21
= - 3 /42 - 4 /42
= - 7 /42
= - 1 /6
B = 1/15 - 7 /25
= 5 /75 - 21/75
= - 16/75
bonne journée
bonjour
A = - 1/14 - 2 /21
= - 3 /42 - 4 /42
= - 7 /42
= - 1 /6
B = 1/15 - 7 /25
= 5 /75 - 21/75
= - 16/75
bonne journée