Question

Номер 805:выполните действия

Answer 1

2) $-1frac{1}{7} ( frac{4}{5} + frac{19}{20} )*( 6frac{5}{6} +4 frac{2}{3} )=- frac{8}{7}*( frac{16}{20} + frac{19}{20} )*( frac{41}{6} + frac{14}{3} ) \ \ =- frac{8}{7} * frac{35}{20} *( frac{41}{6} + frac{28}{6} )=-2* frac{69}{6} =-23$
1) $2 frac{1}{2} ( frac{2}{15} -3 frac{5}{6} )-2 frac{3}{4} = frac{5}{2} ( frac{2}{15} - frac{23}{6} )- frac{11}{4} = frac{5}{2} ( frac{4}{30} - frac{115}{30} )- frac{11}{4} \ \ = frac{5}{2} (- frac{111}{30} )- frac{11}{4} = -frac{37}{4} - frac{11}{4} =- frac{48}{4} =-12$
3) $(6 frac{3}{8} -2 frac{3}{4} )*(-4)+ frac{7}{18} *9=( frac{51}{8} - frac{11}{4} )*(-4)+ frac{7}{2} = \ \ ( frac{51}{8} - frac{22}{8}) *(-4)+ frac{7}{2} = frac{29}{8} *(-4)+ frac{7}{2} =- frac{29}{2} + frac{7}{2} =-11$
4)$9 frac{1}{6} :(4 frac{1}{3} -8)+24* frac{3}{8} = frac{55}{6} :(-3 frac{2}{3} )+9= frac{55}{6} *(- frac{3}{11} )+9= \ \ -frac{5}{2}+9=-2,5+9=6,5$