Bonsoir
A =2/3 + 5/3×1/15
A = 2/3 + 5/45
A = (2 x 15) / (3 x 15) + 5/45
A = 30/45 + 5/45
A = 35/45
A = (5 x 7) / (5 x9)
A = 7/9
B=(1-1/7)÷12/5
B = [(1 x 7) / (1 x 7) - 1/7] : 12/5
B = (7/7 - 1/7) : 12/5
B = 6/7 x 5/12
B = 30/84
B = (6 x 5) / (6 x 14)
B = 5/14.
