Odpowiedź:
[tex]a) \frac{2}{3} : \frac{4}{6} =\frac{2}{3} * \frac{6}{4} =\frac{2}{2} =1\\b) \frac{1}{15} :3\frac{1}{3} =\frac{1}{15} * \frac{3}{10} =\frac{1}{50} \\c) 1\frac{1}{3} * \frac{9}{16} =\frac{4}{3} * \frac{9}{16} =\frac{3}{4}\\d) \frac{17}{20} - \frac{3}{5} =\frac{17}{20} - \frac{12}{20} =\frac{5}{20}=\frac{1}{4} \\e) 6\frac{3}{5} - 2\frac{3}{4} =\frac{33}{5} - \frac{11}{4} =\frac{132}{20} - \frac{55}{20} =\frac{77}{20} \\f) \frac{5}{6} + \frac{3}{4} =\frac{20}{24} + \frac{18}{24} =\frac{38}{24}\\[/tex]
[tex]g) 2\frac{1}{5} + 3\frac{1}{2} =\frac{11}{5} + \frac{7}{2} =\frac{22}{10} + \frac{35}{10} =\frac{57}{10} \\h) 6\frac{3}{4} + 2\frac{5}{8} - 4\frac{9}{16} =\frac{108}{16} + \frac{42}{16} - \frac{73}{16} =\frac{77}{16}\\k) (\frac{3}{8} +\frac{2}{5})* \frac{5}{13} =(\frac{15}{40} + \frac{16}{40}) * \frac{5}{13} = \frac{31}{40} * \frac{5}{13} = \frac{31}{104}[/tex]
Szczegółowe wyjaśnienie: