Răspuns :
[tex]\frac{1}{2}+1\frac{2}{9}=\frac{1}{2}+\frac{9\cdot1+2}{9}=\\
=\frac{1}{2}+\frac{11}{9}=\frac{9*1+2*11}{18}=\frac{31}{18}[/tex]
=\frac{1}{2}+\frac{11}{9}=\frac{9*1+2*11}{18}=\frac{31}{18}[/tex]