Question

Determine o valor da expressao numerica
1/2-(1/4-1-3/10)-(9/10+4/5)

Answer 1

$\frac{1}{2} \ - (\frac{1}{4} \ - \ 1 \ - \frac{3}{10}) \ - \ (\frac{9}{10} \ + \frac{4}{5}) \ = \\ \\ mmc \ (2, \ 4, \ 5, \ 10) \ = \ 20 \\ \\ \frac{10 \ - \ (5 \ - \ 20 \ - \ 6) \ - \ (18 \ + \ 16)}{20} \ = \\ \\ \frac{10 \ - \ 5 \ + \ 20 \ + \ 6 \ - \ 18 \ - \ 16}{20} \ = \\ \\ \frac{- \ 3}{\ \ 20}$

Answer 2

Veja o desenvolvimento anexado.