[tex]1) 7-1\frac{4}{5} = \frac{7}{1}-\frac{9}{5}=\frac{35-9}{5}= \frac{26}{5} =5\frac{1}{5} \\2)6\frac{4}{5}-1\frac{1}{5}=\frac{34}{5}-\frac{6}{5}= \frac{28}{5} =5\frac{3}{5} \\ 3)3\frac{1}{5} +2\frac{1}{5}=\frac{16+11}{5}=\frac{27}{5}=5\frac{2}{5} \\ 4)4\frac{1}{5} +1\frac{4}{5}=\frac{21+9}{5}=\frac{30}{5} =6[/tex]Ответ:

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