30 целых 5/6 - (7 целых 1/3 +2 целых 1/4) : 1/4

[latex]30 frac{5}{6} - (7 frac{1}{3} +2 frac{1}{4} ) : frac{1}{4} =30 frac{5}{6} - (7 frac{4}{12} +2 frac{3}{12} ) : frac{1}{4} =30 frac{5}{6} - 9 frac{7}{12} : frac{1}{4} =[/latex][latex]30 frac{5}{6} - frac{115}{12} *frac{4}{1} =30 frac{5}{6} - frac{115}{3} =30 frac{5}{6} - 38frac{1}{3} =30 frac{5}{6} - 38frac{2}{6} =-8 frac{3}{6} =-8 frac{1}{2} [/latex]