Bonjour,
G = (1/8 + 7/12)/(5/6 - 4/15)
= [(1x3+7x2)/24] / [(5x5 - 4x2)/15]
= (17/24)/(17/15)
= (17/24)(15/17)
= 15/24
= (3x5)/(3x8)
= 5/8.
Bonne journée.
