D=1/3-1/3×4/7 aider moi svp​

Bonjour,

D = 1/3 - 1/3 x 4/7

D = 1/3 - (1 x 4)/(3 x 7)

D = 1/3 - 4/21

D = (1 x 7)/(3 x 7) - 4/21

D = 7/21 - 4/21

D = 3/21

D = 1/7