Вопрос:

3) \(\left(2\frac{3}{4}+2\frac{1}{5}\right)\cdot16\)

Ответ:

\(2\frac{3}{4}=\frac{11}{4}\), \(2\frac{1}{5}=\frac{11}{5}\).

\(\left(\frac{11}{4}+\frac{11}{5}\right)\cdot16=\frac{99}{20}\cdot16=\frac{396}{5}=79\frac{1}{5}\).

Ответ: \(79\frac{1}{5}\).