Aidez moi svp Merci d’avance

Bonjour,

1)
9 = 3 x 3
12 = 3 x 4
9/12 = 3/4

2)
1 - (7/16 + 3/4)
= 1 - (7/16 + (3 x 4)/(4 x 4))
= 1 - (7/16 + 12/16)
= 1 - 19/16
= 1/1 - 19/16
= (1 x 16)/(1 x 16) - 19/16
= 16/16 - 19/16
= -3/16

Bonne fin de journee