Odpowiedź:
zad.13
[tex]\frac{1}{5} +\frac{3}{5} = \frac{4}{5} \\[/tex]
[tex]\frac{2}{5} + \frac{3}{5} = 5[/tex]
[tex]2 - \frac{3}{5} = 1 \frac{2}{5}[/tex]
[tex]3 \frac{1}{5} + \frac{3}{5} = 3 \frac{4}{5}[/tex]
[tex]\frac{7}{5} - \frac{3}{5} = \frac{4}{5}[/tex]
[tex]1 \frac{1}{5} - \frac{3}{5} = \frac{3}{5}[/tex]
[tex]4 \frac{3}{5} + \frac{3}{5} = 5\frac{1}{5}[/tex]
[tex]6 \frac{2}{5} + \frac{3}{5} = 7[/tex]
zad.14
[tex]a) 3 \frac{1}{7} + 5\frac{4}{7} - 1 \frac{6}{7} = 8 \frac{5}{7} - 1 \frac{6}{7} = 6 \frac{6}{7}[/tex]
[tex]b) 4- (5 \frac{1}{3} - 2 \frac{2}{3}) = 4 - 2\frac{2}{3} = 1\frac{1}{3}[/tex]
