Question

номер 937 938 решите пж. Дам лучший ответ и спасибо!

Answer 1

937. 
а) $(frac{1}{2}:frac{3}{4}-frac{4}{9}):frac{3}{5}$ = $(frac{1}{2}*frac{4}{3}-frac{4}{9})*frac{5}{3}$ = $(frac{2}{3}-frac{4}{9})*frac{5}{3}$ = $(frac{6}{9}-frac{4}{9})*frac{5}{3}$ = $frac{2}{9}*frac{5}{3}$ = $frac{10}{27};$
б) $frac{1}{2}:frac{3}{8}-frac{4}{9}:frac{3}{5}$ = $frac{1}{2}*frac{8}{3}-frac{4}{9}*frac{5}{3}$ = $frac{4}{3}-frac{20}{27}$ = $frac{36}{27}-frac{20}{27}$ = $frac{16}{27};$
в) $frac{3}{5}:(frac{9}{10}-frac{3}{5}*frac{8}{9})$ = $frac{3}{5}:(frac{9}{10}-frac{1}{5}*frac{8}{3})$ = $frac{3}{5}:(frac{9}{10}-frac{8}{15})$ = $frac{3}{5}:(frac{27}{30}-frac{16}{30})$ = $frac{3}{5}:frac{11}{30}$ = $frac{3}{5}*frac{30}{11}$ = $frac{3}{1}*frac{6}{11}$ = $frac{18}{11}$ = $1frac{7}{11};$
г) $frac{3}{5}:frac{9}{10}-frac{3}{5}*frac{8}{9}$ = $frac{3}{5}*frac{10}{9}-frac{3}{5}*frac{8}{9}$ = $frac{3}{5}(frac{10}{9}-frac{8}{9})$ = $frac{3}{5}*frac{2}{9}$ = $frac{1}{5}*frac{2}{3}$ = $frac{2}{15}.$

938.
а) $4*frac{1}{5}+4*frac{3}{7}-4*frac{1}{35}$ = $4(frac{1}{5}+frac{3}{7}-frac{1}{35})$ = $4(frac{7}{35}+frac{15}{35}-frac{1}{35})$ = $4*frac{21}{35}$ = $4*frac{21:7}{35:7}$ = $4*frac{3}{5}$ = $frac{12}{5}$ = $2frac{2}{5};$
б) $frac{3}{8}*5+frac{5}{56}-frac{1}{7}:frac{1}{5}$ = $frac{3}{8}*5+frac{5}{56}-frac{1}{7}*5$ = $5(frac{3}{8}-frac{1}{7})+frac{5}{56}$ = $5(frac{21}{56}-frac{8}{56})+frac{5}{56}$ = $5*frac{13}{56}+frac{5}{56}$ = $frac{65}{56}+frac{5}{56}$ = $frac{70}{56}$ = $1frac{14}{56}$ = $1frac{1}{4};$
в) $frac{3}{2}*frac{5}{6}+frac{3}{2}:frac{9}{10}-frac{3}{2}*frac{13}{18}$ = $frac{3}{2}*frac{5}{6}+frac{3}{2}*frac{10}{9}-frac{3}{2}*frac{13}{18}$ = $frac{3}{2}(frac{5}{6}+frac{10}{9}-frac{13}{18})$ = $frac{3}{2}(frac{15}{18}+frac{20}{18}-frac{13}{18})$ = $frac{3}{2}*frac{22}{18}$ = $frac{3}{1}*frac{11}{18}$ = $frac{1}{1}*frac{11}{6}$ = $frac{11}{6}$ = $1frac{5}{6};$
г) $frac{4}{5}:frac{5}{8}-frac{4}{5}*frac{24}{25}+frac{1}{25}:frac{5}{4}$ = $frac{4}{5}*frac{8}{5}-frac{4}{5}*frac{24}{25}+frac{1}{25}*frac{4}{5}$ = $frac{4}{5}(frac{8}{5}-frac{24}{25}+frac{1}{25})$ = $frac{4}{5}(frac{40}{25}-frac{24}{25}+frac{1}{25})$ = $frac{4}{5}*frac{17}{25}$ = $frac{68}{125}.$

Answer 2

чтоор?