Question

Alguem sabe resolver essa expressão ??
  2 x (-1 ) + 5  x ( 1 )
  5      9      6      3

Answer 1

2/5 . -1/9 + 5 /6  . 1/ 3   =
   -2 / 45 + 5/ 18  =
 - 4 /90 + 25 /90 =  21/90 = 7/30

Answer 2

$\dfrac{2}{5}\times\left(-\dfrac{1}{9}\right)+\dfrac{5}{6}\times\dfrac{1}{3}\\\\ \left(-\dfrac{2}{45}\right)+\dfrac{5}{18}=\dfrac{5}{18}-\dfrac{2}{45}\\\\ \dfrac{5\cdot5}{90}-\dfrac{2\cdot2}{90}=\dfrac{25}{90}-\dfrac{4}{90}\\\\ \dfrac{21}{90}=\dfrac{21\div3}{90\div3}=\boxed{\dfrac{7}{30}}$