Odpowiedź:
[tex]2\frac{3}{5} + 7 \frac{1}5} = \frac{13}{5}+ \frac{36}{5} =\frac{49}{5} = 9 \frac{4}{5}[/tex]
[tex]6\frac{8}{9} - 2\frac{5}{9} =\frac{62}{9} -\frac{23}{9} =\frac{39}{9} = 4 \frac{3}{9}[/tex]
[tex]\frac{2}{3} +\frac{3}{5} =\frac{10}{15} + \frac{9}{15} =\frac{19}{15} =1\frac{4}{15}[/tex]
[tex]\frac{2}{3} -\frac{3}{5} =\frac{10}{15} - \frac{9}{15} =\frac{1}{15}[/tex]
[tex]1\frac{2}{7} -\frac{1}{2} =\frac{18}{14} - \frac{7}{14} =\frac{11}{14}[/tex]
[tex]2\frac{3}{4} -\frac{5}{12} =\frac{33}{12} - \frac{5}{12} =\frac{28}{12}=2\frac{4}{12} =2\frac{2}{6}[/tex]
[tex]9\frac{5}{8} -5\frac{7}{10} =\frac{77}{8} - \frac{57}{10} =\frac{770}{80}- \frac{456}{80}=\frac{314}{80} =\frac{157}{40} =3\frac{37}{40}[/tex]
