Écris les expressions suivantes sous forme fractionnaire A= 9: (12+3) B = 10-8 : 2 C = (12 + 4) : (8 + 10)

Bonsoir,

A= 9 /(12+3)
A = 9/15
A = 3 x 3 / 3 x 5
A = 3/5

B = 10 - 8/2
B = 10 x 2 / 1 x 2 - 8/2
B = 20/2 - 8/2
B = 12/2
B = 2 x 6 / 2 x 1
B = 6

C = (12 + 4) / (8 + 10)
C = 16/18
C = 2 x 8 / 2 x 9
C = 8/9