Hej!
[tex]a] \ 5\frac{3}{8}-3\frac{5}{6}=5\frac{9}{24}-3\frac{20}{24}=4\frac{33}{24}-3\frac{20}{24}=1\frac{13}{24}\\\\b] \ 3\frac{2}{3}+\frac{4}{7}+\frac{2}{9}+\frac{1}{3}=4+\frac{4}{7}+\frac{2}{9}=4+\frac{36}{63}+\frac{14}{63}=4+\frac{50}{63}=4\frac{50}{63}\\\\c] \ 145\frac{3}{10}-142\frac{7}{15}=145\frac{9}{30}-142\frac{14}{30}=144\frac{39}{30}-142\frac{14}{30}=2\frac{25}{30}=2\frac{5}{6}\\\\d] \ 2\frac{2}{7}\cdot2\frac{5}{8}=\frac{\not16^2}{\not7_1}\cdot\frac{\not21^3}{\not8_1}=2\cdot3=6[/tex]
[tex]e] \ 3\frac{2}{9}:19\frac{1}{3}=\frac{29}{9}:\frac{58}{3}=\frac{29}{9}\cdot\frac{3}{58}=\frac{1}{6}[/tex]
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