Question

calcule a expresao numerica b 7/8 - 5/6 +8/9-7/9=
c 1+1/2-1/5-7/4 -5/4

Answer 1

b)

$\frac{7}{8} - \frac{5}{6} + \frac{8 - 7}{9} \\ \frac{7}{8} - \frac{5}{6} + \frac{1}{9} \\ \frac{63 - 60 + 8}{72} \\ \frac{11}{72}$

c)

$\frac{2}{2} - \frac{1}{5} - \frac{7}{4} - \frac{5}{4} \\ 1 - \frac{1}{5} - \frac{7}{4} - \frac{5}{4} \\ - \frac{11}{5}$