Question

(2 56 + 1 79) • 3 35 + (2 56 - 1 79) •(-2 1619)

Answer 1

$(2 frac{5}{6}+1 frac{7}{9})*3 frac{3}{5}+(2 frac{5}{6}-1 frac{7}{9})*(-2 frac{16}{19})=$
$=(frac{17}{6}+frac{16}{9})*frac{18}{5}+(frac{17}{6}-frac{16}{9})*(-frac{54}{19})=$
$=(frac{51}{18}+frac{32}{18})*frac{18}{5}-(frac{51}{18}-frac{32}{18})*frac{54}{19}=$
$=frac{83}{18}*frac{18}{5}-frac{19}{18}*frac{54}{19}= frac{83}{5}-3= 16frac{3}{5}-3=13frac{3}{5}$