Răspuns:
1,15
Explicație pas cu pas:
[tex]2* \frac{1}{5} - \frac{1}{-1,(3)} =[/tex]
[tex]= \frac{2}{5} + \frac{1}{\frac{13-1}{9} }[/tex]
[tex]= \frac{2}{5} + \frac{9}{12}[/tex]
[tex]= \frac{2}{5} + \frac{3}{4}[/tex]
[tex]= \frac{2*4}{20} + \frac{3*5}{20}[/tex]
[tex]= \frac{8+15}{20}[/tex]
[tex]= \frac{23}{20}[/tex]
[tex]= 1,15[/tex]