(3.9 - 5.8) - (-1/45 - 7/9) + 1.1

1) [tex] \frac{39}{10}- \frac{58}{10}= \frac{-19}{10} [/tex]
2) [tex] \frac{-1}{45}- \frac{7}{9}= \frac{-1-35}{45}= \frac{-36}{45} = \frac{-4}{5} [/tex]
3) [tex] \frac{-19}{10}- \frac{-4}{5}= \frac{-19+8}{10}= \frac{-11}{10} [/tex]
4) -1,1+1,1 = 0