A=$\frac{-7}{813}$+496.($\frac{-7}{813}$)+($\frac{-7}{813}$).316
=$\frac{-7}{813}$.(1+496+316)
=$\frac{-7}{813}$.813
=-7
B=$\frac{-9}{10}$.$\frac{5}{14}$+$\frac{1}{10}$-($\frac{-9}{2}$)+$\frac{1}{7}$.($\frac{-9}{10}$)
=$\frac{-9}{10}$.$\frac{5}{14}$+($\frac{-9}{20}$)+$\frac{1}{7}$.($\frac{-9}{10}$)
=$\frac{-9}{10}$.$\frac{5}{14}$+$\frac{1}{2}$-($\frac{-9}{10}$)+$\frac{1}{7}$.($\frac{-9}{10}$)
=$\frac{-9}{10}$.($\frac{-5}{14}$.$\frac{1}{2}$.$\frac{1}{7}$)
=$\frac{-9}{10}$.$\frac{2}{7}$
=$\frac{-9}{35}$
