D\(=\frac{43}{37}.\left(\frac{23}{15}-\frac{8}{15}\right)+\frac{31}{37}\)
\(=\frac{43}{37}.1+\frac{31}{37}\)
\(=\frac{43+31}{37}\)
\(=\frac{74}{37}\)
\(=2\)
E = \(\frac{-5}{24}\left(\frac{9}{11}+\frac{2}{11}\right)+\frac{7}{12}\)
\(=\frac{-5}{24}.1+\frac{14}{24}\)
\(=\frac{-5+14}{24}\)
\(=\frac{9}{24}=\frac{3}{8}\)
a)\(\frac{3}{7}+\frac{11}{14}-\frac{7}{3}.\frac{6}{7}\)
\(=\frac{6+11}{14}-\frac{6}{3}\)
\(=\frac{17}{14}-2\)
\(=\frac{17-28}{14}\)
\(=\frac{-11}{14}\)
b)\(\frac{6}{5}:\frac{3}{2}-\frac{2}{3}.\frac{9}{14}\)
\(=\frac{6}{5}.\frac{2}{3}-\frac{3}{7}\)
\(=\frac{4}{5}-\frac{3}{7}\)
\(=\frac{4.7-3.5}{35}\)
\(=\frac{13}{35}\)
