A= 1/7 +16/9+25/9 aider moi pour mon devoir merci B=23/7:(7/16-16/9) / =barre de fraction

A = 1/7 + 16/9 + 25/9
A = 1 x 9 / 7 x 9 + 16 x 7 / 9 x 7
A = 9/63 + 112/63
A = 121/63

B = 23/7 : (7/16 - 16/9)
B = 23/7 : - 9/9
B = 23/7 x - 1
B = - 23/7

bonjour

a = 1/7 + 16/9 + 25/9
a = 9/63 + 112/63 + 175/63
a = 296/63

b = 23/7 : (7/16 - 16/9)
b = 23/7 : ( 7/16 - 16/9)
b = 23/7 :  - 193/144
b = 23/7 x - 144/193
b = - 3312/1351