a= -4sur6 + 5sur6 x (-3sur7)

Sagot :

Bonsoir,

A = -4/6 + 5/6 * -3/7 = -4/6 + (-15/42) = -4/6 - 15/42 = (-4*7)/6*7 - 15/42

= -28/42 - 15/42 = -43/42

Bonne soirée.