a)
[tex]1 \frac{1}{4} + \frac{2}{5} = 1 \frac{5}{20} + \frac{8}{20} = 1 \frac{13}{20} [/tex]
b)
[tex]5 \frac{3}{4} + 1 \frac{3}{7} = 5 \frac{21}{28} + 1 \frac{12}{28} = 6 \frac{33}{28} = 7 \frac{5}{28} [/tex]
c)
[tex]4 \frac{2}{3} - 2 \frac{1}{7} = 4 \frac{14}{21} - 2 \frac{3}{21} = 2 \frac{11}{21} [/tex]
d)
[tex]7 \frac{1}{10} - 6 \frac{4}{5} = 7 \frac{1}{10} - 6 \frac{8}{10} = 6 \frac{11}{10} - 6 \frac{8}{10} = \frac{3}{10} [/tex]
Myślę że pomogłem ;)
