(3/5-1/2)x5/2 8/3-2/3:8/7

(3/5-1/5)x5/2=1/4 ce qui fais 0.25
8/3-2/3:8/7=29/19 ce qui fait 2,41

A = (3/5-1/2)x5/2
A = (6 - 5) / 10  x 5/2
A = 1/10 x 5/2
A = 5/20
A = 1/4



B = 8/3 - 2/3 / 8/7
B = 6/3 / 8/7
B = 6/3 x 7/8
B = 3/3 x 7/4
B = 1 x 7/4
B = 7/4