Question

Answer 1

10: =-5/7(2/11+9/14)+12/7

=-5/7*127/154+12/7

=1213/1078

11: \(=\dfrac{2}{5}-\dfrac{2}{5}+\dfrac{3}{11}=\dfrac{3}{11}\)

12: \(=\dfrac{3}{4}-\dfrac{43}{80}:\dfrac{43}{40}=\dfrac{3}{4}-\dfrac{1}{2}=\dfrac{1}{4}\)

13: \(=\dfrac{-16}{5}\cdot\dfrac{-15}{64}+\dfrac{-22}{15}:\dfrac{47}{24}\)

\(=\dfrac{1}{940}\)

14: \(=\dfrac{6}{7}\left(\dfrac{8}{13}+\dfrac{9}{9}-\dfrac{3}{13}\right)=\dfrac{6}{7}\cdot\dfrac{18}{13}=\dfrac{108}{91}\)

15: \(=\dfrac{-9}{10}\cdot\left(\dfrac{5}{14}+\dfrac{1}{7}\right)+\dfrac{1}{10}\cdot\dfrac{-9}{2}\)

\(=\dfrac{-9}{10}\left(\dfrac{5}{14}+\dfrac{2}{14}-\dfrac{1}{2}\right)=\dfrac{-9}{10}\cdot0=0\)