Ответ:
\(2-1\frac{11}{21}=2-\frac{32}{21}=\frac{10}{21}\).
\(\frac{4}{9}\cdot\frac{10}{21}=\frac{40}{189}\).
\(\frac{9}{10}+\frac{40}{189}-\frac{5}{3}=\frac{1701+400-3150}{1890}=-\frac{1049}{1890}\).
Ответ: \(-\frac{1049}{1890}\).
\(2-1\frac{11}{21}=2-\frac{32}{21}=\frac{10}{21}\).
\(\frac{4}{9}\cdot\frac{10}{21}=\frac{40}{189}\).
\(\frac{9}{10}+\frac{40}{189}-\frac{5}{3}=\frac{1701+400-3150}{1890}=-\frac{1049}{1890}\).
Ответ: \(-\frac{1049}{1890}\).