Odpowiedź:
[tex]\frac{4}{7} +\frac{5}{7} =\frac{7}{7}=1 [/tex]
[tex]2\frac{5}{9} +1\frac{4}{9} =3\frac{9}{9} =4[/tex]
[tex]5+1\frac{5}{6} =6\frac{5}{6} [/tex]
[tex]\frac{5}{6} -\frac{3}{6} =\frac{2}{6} [/tex]
[tex]4\frac{5}{8} -1\frac{3}{8} =3\frac{2}{8} [/tex]
[tex]7\frac{4}{5} - 3 = 4\frac{4}{5} [/tex]
[tex]4\frac{2}{7} +\frac{3}{7} -1\frac{4}{7} =4\frac{5}{7} -1\frac{4}{7} =3\frac{1}{7} [/tex]
[tex]3\frac{2}{5} +(4-\frac{2}{5} )= 3\frac{2}{5} + 3\frac{3}{5} =6\frac{5}{5}=7 [/tex]
[tex]3\frac{9}{10} -2\frac{3}{10} +1\frac{4}{10} =1\frac{6}{10} +1\frac{4}{10} =2\frac{10}{10} =3[/tex]
