Odpowiedź:
[tex]b - 0.28 = 0.11 \: \: \: \: \: | + 0.28 \\ b = 0.39[/tex]
[tex]r - \frac{5}{7} = 1 \frac{6}{7} \: \: \: \: \: | + \frac{5}{7} \\ r = 1 \frac{11}{7} \\ r = 2 \frac{4}{7} [/tex]
[tex]2.5 - s = \frac{1}{4} \: \: \: \: \: | - 2.5 \\ - s = - 0.25 - 2.5 \\ - s = - 2.75 \: \: \: \: \: | \times ( - 1) \\ s = 2.75[/tex]
