calculer puis simplifier 7/24-5/8 calculer les expressions b=-4+7/3

7/24 - 5/8
= 7/24 - 5 x 3 / 8 x 3
= 7/24 - 15/24
= - 8/24 = 8 x - 1 / 8 x 3
= - 1/3

b = - 4 + 7/3
b = - 4 x 3 / 1 x 3 + 7/3
b = - 12/3 + 7/3
b = - 5/3