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[tex]2,4+\frac{2}{3}=2\frac{4}{10}+\frac{2}{3}=2\frac{2}{5}+\frac{2}{3}=2\frac{6}{15}+\frac{10}{15}=2\frac{16}{15}=3\frac{1}{15}\\\\2\frac{7}{20}+5,3=2\frac{35}{100}+5,3=2,35+5,3=7,65\\\\1\frac{3}{5}-3,8=-(3,8-1\frac{3}{5})=-(3,8-1\frac{6}{10})=-(3,8-1,6)=-2,2\\\\0,7-4\frac{2}{7}=-(4\frac{2}{7}-0,7)=-(4\frac{2}{7}-\frac{7}{10})=-(4\frac{20}{70}-\frac{49}{70})=-(3\frac{90}{70}-\frac{49}{70})=-3\frac{41}{70}[/tex]
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