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а) $\frac{1}{2} - \frac{1}{4} = \frac{2}{4} - \frac{1}{4} = \frac{1}{4}$ б) $\frac{5}{9} - \frac{1}{3} = \frac{5}{9} - \frac{3}{9} = \frac{2}{9}$ в) $\frac{7}{10} - \frac{3}{5} = \frac{7}{10} - \frac{6}{10} = \frac{1}{10}$ г) $\frac{16}{27} - \frac{1}{9} = \frac{16}{27} - \frac{3}{27} = \frac{13}{27}$ д) $\frac{3}{5} - \frac{13}{45} = \frac{27}{45} - \frac{13}{45} = \frac{14}{45}$ е) $\frac{1}{3} - \frac{8}{27} = \frac{9}{27} - \frac{8}{27} = \frac{1}{27}$ ж) $\frac{1}{2} - \frac{1}{3} = \frac{3}{6} - \frac{2}{6} = \frac{1}{6}$ з) $\frac{3}{5} - \frac{1}{3} = \frac{9}{15} - \frac{5}{15} = \frac{4}{15}$ и) $\frac{7}{8} - \frac{2}{3} = \frac{21}{24} - \frac{16}{24} = \frac{5}{24}$ к) $\frac{3}{4} - \frac{4}{7} = \frac{21}{28} - \frac{16}{28} = \frac{5}{28}$ л) $\frac{9}{16} - \frac{11}{24} = \frac{27}{48} - \frac{22}{48} = \frac{5}{48}$ м) $\frac{11}{12} - \frac{11}{18} = \frac{33}{36} - \frac{22}{36} = \frac{11}{36}$