Выполните действия: А) 3/8 : 5/12- 3 1/2 * 2/5+ 1 : 3 1/3 Б)1 1/4 *(-2 2/3)+ 4/5 * 2 11/12- 1 1/6 : 21/22 В)3/4 : (1/14 - 5/7) + (5/6 -7/12) * 6 2/3 Распишите по действиям.

a)[latex] frac{3}{8} : frac{5}{12} - 3 frac{1}{2} * frac{2}{5} + 1 : 3 frac{1}{3}=- frac{1}{5}[/latex]1) [latex] frac{3}{8} : frac{5}{12} = frac{3}{8} * frac{12}{5}= frac{9}{10} [/latex]2) [latex]3 frac{1}{2} * frac{2}{5} = frac{7}{2} * frac{2}{5}= frac{14}{10} =1 frac{4}{10}=1 frac{2}{5} [/latex]3) [latex] 1 : 3 frac{1}{3}= 1: frac{10}{3} =1* frac{3}{10} = frac{3}{10} [/latex]4) [latex] frac{9}{10}-1 frac{2}{5} = frac{9}{10}-1 frac{4}{10} = - frac{5}{10} =- frac{1}{2} [/latex]5) [latex]- frac{5}{10} + frac{3}{10} =- frac{2}{10} =- frac{1}{5} [/latex]б)[latex]1 frac{1}{4} *(-2 frac{2}{3} )+ frac{4}{5} * 2 frac{11}{12} - 1 frac{1}{6} : frac{21}{22}=-2 frac{2}{9}[/latex]1) [latex]1 frac{1}{4} *(-2 frac{2}{3} )= frac{5}{4}*(- frac{8}{3})=- frac{10}{3} =-3 frac{1}{3} [/latex]2) [latex] frac{4}{5} * 2 frac{11}{12}= frac{4}{5} * frac{35}{12}= frac{7}{3}=2 frac{1}{3} [/latex]3) [latex]1 frac{1}{6} : frac{21}{22}= frac{7}{6} * frac{22}{21} = frac{11}{9} =1 frac{2}{9} [/latex]4) [latex]-3 frac{1}{3}+2 frac{1}{3}=-1 [/latex]5) [latex]-1-1 frac{2}{9}=-2 frac{2}{9} [/latex]в) [latex] frac{3}{4} : ( frac{1}{14} - frac{5}{7} ) + ( frac{5}{6} - frac{7}{12} ) * 6 frac{2}{3} =frac{1}{2}[/latex]1) [latex] frac{1}{14} - frac{5}{7}= frac{1}{14}- frac{10}{14} =- frac{9}{14} [/latex]2) [latex] frac{5}{6} - frac{7}{12}= frac{10}{12} - frac{7}{12} = frac{3}{12} = frac{1}{4} [/latex]3) [latex] frac{3}{4} : (- frac{9}{14} )=- frac{3}{4} * frac{14}{9} =- frac{7}{6}=-1 frac{1}{6} [/latex]4) [latex]frac{1}{4} * 6 frac{2}{3} = frac{1}{4}* frac{20}{3} = frac{5}{3} =1 frac{2}{3} [/latex]5) [latex]-1 frac{1}{6} +1 frac{2}{3} =-1 frac{1}{6} +1 frac{4}{6} = frac{3}{6} = frac{1}{2} [/latex]