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а) $1\frac{1}{3} + 1\frac{1}{5} = \frac{4}{3} + \frac{6}{5} = \frac{4 \cdot 5}{3 \cdot 5} + \frac{6 \cdot 3}{5 \cdot 3} = \frac{20}{15} + \frac{18}{15} = \frac{38}{15} = 2\frac{8}{15}$ б) $3 - 1\frac{1}{4} = \frac{3}{1} - \frac{5}{4} = \frac{3 \cdot 4}{1 \cdot 4} - \frac{5}{4} = \frac{12}{4} - \frac{5}{4} = \frac{7}{4} = 1\frac{3}{4}$ в) $2\frac{1}{9} + 1\frac{1}{3} = \frac{19}{9} + \frac{4}{3} = \frac{19}{9} + \frac{4 \cdot 3}{3 \cdot 3} = \frac{19}{9} + \frac{12}{9} = \frac{31}{9} = 3\frac{4}{9}$ г) $2\frac{1}{2} - 1\frac{1}{3} = \frac{5}{2} - \frac{4}{3} = \frac{5 \cdot 3}{2 \cdot 3} - \frac{4 \cdot 2}{3 \cdot 2} = \frac{15}{6} - \frac{8}{6} = \frac{7}{6} = 1\frac{1}{6}$ д) $3\frac{1}{3} - 2\frac{2}{5} = \frac{10}{3} - \frac{12}{5} = \frac{10 \cdot 5}{3 \cdot 5} - \frac{12 \cdot 3}{5 \cdot 3} = \frac{50}{15} - \frac{36}{15} = \frac{14}{15}$ е) $3\frac{2}{3} + 3\frac{3}{4} = \frac{11}{3} + \frac{15}{4} = \frac{11 \cdot 4}{3 \cdot 4} + \frac{15 \cdot 3}{4 \cdot 3} = \frac{44}{12} + \frac{45}{12} = \frac{89}{12} = 7\frac{5}{12}$ ж) $5\frac{1}{5} - 4\frac{1}{4} = \frac{26}{5} - \frac{17}{4} = \frac{26 \cdot 4}{5 \cdot 4} - \frac{17 \cdot 5}{4 \cdot 5} = \frac{104}{20} - \frac{85}{20} = \frac{19}{20}$ з) $9 - 5\frac{1}{3} = \frac{9}{1} - \frac{16}{3} = \frac{9 \cdot 3}{1 \cdot 3} - \frac{16}{3} = \frac{27}{3} - \frac{16}{3} = \frac{11}{3} = 3\frac{2}{3}$ и) $1\frac{1}{3} \cdot 4 = \frac{4}{3} \cdot \frac{4}{1} = \frac{16}{3} = 5\frac{1}{3}$ к) $2\frac{1}{4} \cdot 1\frac{1}{3} = \frac{9}{4} \cdot \frac{4}{3} = \frac{9 \cdot 4}{4 \cdot 3} = \frac{36}{12} = 3$