Bonjour,
Calculer:
C= (5/12) / (7/3 x 8/15 -5/6)= (5/12) / ( (7 x 8/3x15) -5/6) )
= (5/12) / ( (56/45) -5/6) )= (5/12) / ( (56x2 -5x15)/(45x2) )
= (5/12) / ( (112-75) / 90)= (5/12) /( 37/90)= (5x90)/(12x37)= (5/2)(15/37)
= (5x15)/(2x37)= 75/74 on a simplifié 90 et 12 par 6
