Question

(7 1/2*2 2/3-121/4:7/9):6+3 1/8+5 2/7 выражение РЕШИТЕ ПЛИЗЗ ДАЮ 40 БАЛЛОВ

Answer 1

$1)7 frac{1}{2}cdot 2 frac{2}{3}= frac{15}{2}cdot frac{8}{3}= frac{120}{6}=20 \ \ 2) frac{ 121}{4}: frac{7}{9}=frac{ 121}{4}cdot frac{9}{7}= frac{1089}{28} \ \ 3)20- frac{1089}{28} = frac{20cdot 28 - 1089}{28}=- frac{529}{28} \ \ 4) - frac{529}{28}:6=- frac{529}{28}cdot frac{1}{6}=- frac{529}{168} \ \ 5)- frac{529}{168}+3 frac{1}{8}+5 frac{2}{7} = - frac{529}{168}+ frac{25}{8}+frac{37}{7} = frac{-529+25cdot 21+37cdot24}{168}= frac{884}{168}=$

$= frac{221}{42}=5 frac{11}{42}$