Bonsoir !
A = (3 - 7/5 + 3/10) - (7/12 - 1/3)
A = ( 30/10 - 14/10 + 3/10 ) - ( 7/12 - 4/12 )
A = 19/10 - 3/12
A = 228/120 - 30/120
A = 198/120
A = 33/20
B = 3 - ( 2 + 1/7 ) + ( 1/2 + 4 - 5/7 )
B = 3 - ( 14/7 + 1/7 ) + ( 7/14 + 56/14 - 10/14 )
B = 3 - 15/7 + 53/14
B = 3 - 30/14 + 53/14
B = 3 + 23/14
B = 126/42 + 69/42
B = 195/42
B = 65/14.
En espérant t'avoir aidé(e).
