Odpowiedź:
[tex] - 2 \frac{1}{7} - ( - 5 \frac{3}{4} ) = - 2 \frac{1}{7} + 5 \frac{3}{4} = - 2 \frac{4}{28} + 5 \frac{21}{28} = 3 \frac{17}{28} [/tex]
[tex]-2\frac{1}{7} - (-5\frac{3}{4})\\\\-2\frac{1}{7} + 5\frac{3}{4}\\\\-2\frac{4}{28} + 5\frac{21}{28}\\\\-\frac{52}{8} + \frac{161}{28}\\\\\frac{109}{28} = 3\frac{25}{28}[/tex]
