а) [latex](frac{2}{9}+1 frac{2}{3})*3= frac{2}{9}*frac{3}{1} +frac{5}{3}*frac{3}{1}=frac{2}{3}+frac{5}{1}=5frac{2}{3}[/latex]б) [latex] frac{5}{12} *2 frac{3}{7} + frac{5}{12} *3 frac{4}{7} = frac{5}{12} *6= frac{5}{2} =2 frac{1}{2} [/latex]в) [latex](5 frac{2}{9} *3 frac{1}{8} +3 frac{1}{3} )*3-7 frac{2}{3} =frac{47}{9} * frac{25}{8} *3+ frac{10}{3}*3-7 frac{2}{3}= \ = frac{1175}{24} +10-7frac{2}{3}=48frac{23}{24} + 2 frac{1}{3} =51 frac{7}{24}[/latex]г) [latex](5 frac{2}{9} *1,4+3 frac{1}{3} )*3-7 frac{2}{3} = frac{47}{9} * frac{7}{5} *3+ frac{10}{3} *3-7 frac{2}{3} = \ =21 frac{14}{15} +2 frac{5}{15} =24 frac{4}{15} [/latex]

[latex]4. (5 frac{2}{9}*1,4+3 frac{1}{3})*3-7 frac{2}{3}=24 frac{4}{15} \ \ 1)5 frac{2}{9}*1,4=7 frac{14}{45} \ \ 2) 7frac{14}{45}+3 frac{1}{3}=7 frac{14}{45}+3 frac{15}{45}=10 frac{29}{45} \ \ 3) frac{479}{45}*3=31 frac{14}{15} \ \ 4) 31 frac{14}{15}-7frac{2}{3}=31 frac{14}{15}-7 frac{10}{15}=24 frac{4}{15} [/latex][latex]1. ( frac{2}{9}+1 frac{2}{3})*3= frac{2}{3}+5=5 frac{2}{3} \ \ 2. frac{5}{12}*2 frac{3}{7}+ frac{5}{12}*3 frac{4}{7}= frac{5}{12}*( 2frac{3}{7}+3 frac{4}{7})= frac{5}{12}*6=2,5 \ \ 3.(5 frac{2}{9}*3 frac{1}{8}+3 frac{1}{3})*3-7 frac{2}{3}= \ \ 1) frac{47}{9}* frac{25}{8}=16 frac{23}{72} \ \ 2) 16 frac{23}{72}+3 frac{1}{3}=19 frac{47}{72} \ \ 3) 19 frac{47}{72}*3=58 frac{23}{24} \ \ 4)58 frac{23}{24}-7 frac{2}{3}=51 frac{7}{24} \ \ [/latex]