Răspuns:
S = [tex]-\frac{7}{18}[/tex]
Explicație pas cu pas:
-2 → [tex]-\frac{1}{2}[/tex]
6 → [tex]\frac{1}{6}[/tex]
-18 → [tex]-\frac{1}{18}[/tex]
S = [tex]-\frac{1}{2}+\frac{1}{6}+(-\frac{1}{18})[/tex]
S = [tex]-\frac{1}{2}+\frac{1}{6}-\frac{1}{18}[/tex]
S = [tex]-\frac{9}{18}+\frac{3}{18}-\frac{1}{18}[/tex]
S = [tex]\frac{-9+3-1}{18}[/tex]
S = [tex]\frac{-7}{18}[/tex]
S = [tex]-\frac{7}{18}[/tex]
