Question

calcule o valor da expressão numérica a seguir : 

3/4-7/5*(1/2+4/9)-1/5 

Answer 1

$\frac{3}{4} \ - \ \frac{7}{5} \ * \ (\frac{1}{2} \ + \ \frac{4}{9}) \ - \ \frac{1}{5} \ = \\ \\ mmc \ (2, \ 9) \ = 18 \\ \\ \frac{3}{4} \ - \ \frac{7}{5} \ * \ (\frac{9 \ + \ 8}{18}) \ - \ \frac{1}{5} \ = \\ \\ \frac{3}{4} \ - \ \frac{7}{5} \ * \frac{17}{18} \ - \ \frac{1}{5} \ =$

$\frac{3}{4} \ - \ \frac{119}{90} \ - \ \frac{1}{5} \ = \\ \\ mmc \ (4, \ 5, \ 90) \ = \ 180 \\ \\ \frac{135 \ - \ 238 \ - \ 36}{180} \ = \\ \\ - \ \frac{139}{180}$