[tex]a) \ 0,25\cdot\frac{3}{14} = \frac{25}{100}\cdot\frac{3}{14} = \frac{1}{4}\cdot\frac{3}{14} = \frac{3}{56}\\\\b) \ 2,33+2\frac{2}{7} = 2\frac{33}{100}+2\frac{2}{7} = 2\frac{231}{700} + 2\frac{200}{700} = 4\frac{431}{700}\\\\c) \ \frac{15}{28}\cdot\frac{7}{45} = \frac{15}{45}\cdot\frac{7}{28} = \frac{1}{3}\cdot\frac{1}{4} =\frac{1}{12}[/tex]
[tex]d) \ \frac{3}{12}\cdot\frac{5}{9} = \frac{1}{4}\cdot\frac{5}{9} = \frac{5}{36}\\\\e) \ \frac{18}{64}:\frac{6}{8} = \frac{9}{32}:\frac{3}{4} = \frac{9}{32}\cdot\frac{4}{3} = \frac{3}{8}\\\\f) \ \frac{64}{13}:\frac{4}{2}=\frac{64}{13}:2=\frac{64}{13}\cdot\frac{1}{2} = \frac{32}{13} = 2\frac{6}{13}[/tex]
[tex]g) \ \frac{5}{2}-\frac{3}{15} = \frac{75}{30}-\frac{6}{30} = \frac{69}{30} =\frac{23}{10} = 2\frac{3}{10}\\\\h) \ \frac{12}{3}+\frac{15}{9} = 4+\frac{5}{3} = 4+1\frac{2}{3} = 5\frac{2}{3}[/tex]
