prosze o pomoc a) (2-1/7)*3 pod tym jest kreska ulamkowa i jest 2+2/5 b) 8 i 1/5-10 i 3/10 pod tym jest kreska ulamkowa i jest -7 za tym rownaniem jest jeszcze+(-4 i 1/2)*2/5 c)(2 i 1/4+1 i 1/2)*(2 i 2/3-2 i 1/5) pod tym jest kreska ulamkowa i jest 1/5*3

a) [latex] frac{(2-frac{1}{7})*3}{2+frac{2}{5}} = frac{1 frac{6}{7} * 3}{2 frac{2}{5}} = frac{ frac{13}{7}*3}{frac{12}{5}} = frac{39}{7}*frac{5}{12}= frac{195}{84}=2 frac{27}{84}=2 frac{9}{28} [/latex]  b) [latex] frac{8frac{1}{5}-10frac{3}{10}}{-7}+(-4frac{1}{2})*frac{2}{5}=frac{8,2-10,3}{-7}+(-frac{9}{2})*frac{2}{5}=frac{-2,1}{-7}+(-frac{9}{5})=(frac{21}{10}*frac{1}{7})- frac{9}{5}=frac{3}{10}-frac{9}{5}=frac{3}{10}-frac{18}{10}=frac{-15}{10}=-1,5[/latex] c) [latex] frac{(2frac{1}{4} + 1frac{1}{2})*(2frac{2}{3} - 2frac{1}{5})}{frac{1}{5}*3 frac{3}{4}*2frac{2}{3} - 2(2 frac{1}{2}- frac{11}{5})} = frac{(2,25 +1,5)*(frac{40-33}{15})}{frac{1}{5}*frac{15}{4}*frac{8}{3}-2(frac{5}{2}- frac{11}{5})} =frac{(3,75)*(frac{7}{15} )}{2 - (2*frac{3}{5})} =frac{(frac{375}{100})*(frac{7}{15})}{2 - frac{6}{5}} =frac{frac{175}{100}}{frac{4}{5}} =frac{175}{100}* frac{5}{4} =frac{175}{80} = 2frac{15}{80} = 2frac{5}{16}[/latex]  d) [latex]frac{frac{1}{9} * (-frac{1}{2} -frac{3}{5} + frac{3}{4} -frac{1}{10})}{-frac{3}{4}+ frac{3}{5}} = frac{frac{1}{9} * (frac{-10 - 12 + 15 -2}{20})}{frac{-15+12}{20}} = frac{frac{1}{9} * ( frac{-9}{20})}{frac{-3}{20}} = {frac{-1}{20} * (frac{-20}{3}) =frac{1}{3} [/latex]  e) [latex] frac{5 frac{1}{4} :14 + 7 frac{1}{2}*4}{(36: frac{21}{50}-75 frac{3}{14}):3} = frac{(frac{21}{4}*frac{1}{14})+(frac{15}{2}*4)}{(36* frac{50}{21}-frac{1053}{14}):3} = frac{frac{3}{8}+30}{(frac{1200}{14}-frac{1053}{14}):3} =frac{30frac{3}{8}}{(frac{147}{14}*frac{1}{3})} =frac{243}{8}*frac{14}{49}=frac{1701}{196}=8frac{133}{196}=8frac{19}{28}[/latex]