Ответ:

[tex](5\frac{7}{8} -6\frac{1}{12} ):1\frac{7}{18}=-\frac{3}{20}[/tex]

[tex]1)5\frac{7}{8} -6\frac{1}{12} =\frac{47}{8} -\frac{73}{12} =\frac{141-146}{24} =\frac{-5}{24}=-\frac{5}{24}[/tex]

[tex]2)-\frac{5}{24} :1\frac{7}{18} =-\frac{5}{24} :\frac{25}{18}=-(\frac{5*18}{24*25})=-\frac{3}{4*5}=-\frac{3}{20}[/tex]