Bonsoir;

A = 2/15 -1/6

= 4/30- 5/30

= -1/30

B = (2/15 )/ (1/6)

= 2/15*6/1

= 12/15 = 4/5

Explications étape par étape:

A = (2×2)/(15×2) - (1×5)/(6×5) = 4/30 - 5/30 = -1/30

B = 2/15 × 6/1 = 12/15 = 4/5