aider moi svpppppp ses le 104 svppppp

bonsoir

a) 7/5 - 7/3 x 15/14  tu simplifies 7 et 14 et 3 et 15
   7/5 - 1/1 x 5/2 = 7/5 - 5/2 = 14/10 - 25/10 = - 11/10

b) 8/5 - 3/4 : 9/8
b = 8/5 - 3/4 x 8/9
b = 8/5 - 24/36
b = 8/5 - 2/3
b = 24/15 - 10/15 = 14/15


c = ( 8/3 - 2/5) : ( 7/5)
c = ( 24/15 -6/15) : 7/5
c = 18/15 x 5/7
c = 90/105
b = 18/21 = 6/7