Odpowiedź:
[tex]3\frac{1}{2} + b = 5\frac{1}{5} \\\frac{7}{2} +b = \frac{26}{5}\\\frac{35}{10} +b = \frac{52}{10} \\b=\frac{52}{10} -\frac{35}{10} \\b=\frac{17}{10}[/tex]
pozdrawiam;)
