Вариант II. Найдите значение выражения (1—5): 1. 3 − 2/5 · 3 1/3; 2. −3 : 5 1/4 − 2 1/2 : 7/8; 3. 7/8 · 2 2/3 + (−5/6) : 2 1/7; 4. 1/5 − (1 1/2 − 1 2/7 · 7/18); 5*. 3 2/11 · (6 − 13 2/11) + 13 2/11 · (3 2/11 − 6).

Question

Вопрос:

Accepted Answer

\(3-\frac{2}{5}\cdot3\frac{1}{3}=3-\frac{4}{3}=\frac{5}{3}\).
\(-3:5\frac{1}{4}-2\frac{1}{2}:\frac{7}{8}=-\frac{4}{7}-\frac{20}{7}=-\frac{24}{7}\).
\(\frac{7}{8}\cdot2\frac{2}{3}+\left(-\frac{5}{6}\right):2\frac{1}{7}=\frac{7}{3}-\frac{7}{18}=\frac{35}{18}\).
\(\frac{1}{5}-\left(1\frac{1}{2}-1\frac{2}{7}\cdot\frac{7}{18}\right)=\frac{1}{5}-\left(\frac{3}{2}-\frac{1}{2}\right)=-\frac{4}{5}\).
\(3\frac{2}{11}(6-13\frac{2}{11})+13\frac{2}{11}(3\frac{2}{11}-6)=-60\).

Ответ: 1) \(\frac{5}{3}\); 2) \(-\frac{24}{7}\); 3) \(\frac{35}{18}\); 4) \(-\frac{4}{5}\); 5) \(-60\).