[tex](2.75 + 1\frac{1}{6} ) :(2\frac{1}{3} *3\frac{1}{7} -7\frac{1}{4})[/tex]

1) [tex]2\frac{9}{12}+1\frac{2}{12} = 3\frac{11}{12}[/tex]

2) [tex]2\frac{1}{3} *3\frac{1}{7} = \frac{7}{3} *\frac{22}{7} = \frac{1*22}{3*1} = 7\frac{1}{3}[/tex]

3) [tex]7\frac{4}{12} - 7\frac{3}{12} = \frac{1}{12}[/tex]

4) [tex]\frac{47}{12} : \frac{1}{12} = \frac{47*1}{1*1} = 47[/tex]

Ответ: 47.

Удачи!!!