vous pouvez m'expliquer svp ​

Bonjour

A = (3/2 - 1/3) : (3/4 + 2/3)

A = [(3 x 3) / (2 x 3) - (1 x 2) / (3  x 2)] : [(3 x 3) / (4 x 3) + (2x 4) / (3 x 4)]

A = (9/6 - 2/6) : (9/12 + 8/12)

A = 7/6 : 17/12

A = 7/6 x 12/17

A = 84/102

A = (6 x 14) / (6 x 17)

A = 14/17

B = 2 + 2/7 : 5/14

B = 2 + 2/7 x 14/5

B = 2 + 28/35

B = (2 x 5) / (1 x 5) + (7 x 4) / (7 x 5)

B = 10/5 + 4/5

B = 14/5