Réponse :
A = (2/3)² + (7/9 - 6/18)
Explications étape par étape
A = 4/9 + (14/18 - 6/18)
= 8/18 + 8/18 = 16/18
A = 8/9
B = 2/3 x 7/4 - 5/8 + 4/7
= 14/12 - 5/8 + 4/7
= 7/6 - 5/8 + 4/7
= 7x8x7/6x 8x 7 - 5 x 7 x 6/8x 7x 6 + 4 x 6 x 8/8x7x6
= 392/336 - 210/336 + 192/336
= 374/336
= 187/168
