Je m'exerce

Question

Calculer mentalement l'expression \(A = (-6,23)+(+2674,13)+(+6,23)\)

Solution

on constate que \(A =\) \((-6,23)+(+2674,13)+(+6,23)\) = \([ (-6,23) +(+6,23)] +(+2674,13)\)\(=(+2674,13)\)

\(car\) \([ (-6,23) +(+6,23)]=0\)