Respostas

  • Usuário do Brainly
2014-08-21T02:18:02-03:00
B)
 \frac{(-2).3+2-35}{2.(10):20} =

 \frac{-6+2-35}{20:20} =

 \frac{-41+2}{1} =-39

c)

(-1,4)[(- \frac{3}{5} )(- \frac{5}{6} )(- \frac{8}{9} )+1]=

vamos cancelar( 5 com 5), (3 com 6)

- \frac{14}{10} [( \frac{1}{2} )(- \frac{8}{9})+1]=
cancela o 2 com o 8 e multiplica

- \frac{14}{10}[(- \frac{4}{9} +1]=

- \frac{7}{5}[ \frac{-4+9}{9}  ]=

- \frac{7}{5} ( \frac{5}{9} )=- \frac{7}{9}