Question

Вычисли
-6/16•2 4/5
-2/3•{-1 1/2}

Answer 1

Решение и ответ:

$\displaystyle - \frac{6}{{16}} \cdot 2\frac{4}{5}=-\frac{6}{{16}} \cdot \frac{{14}}{5}=- \frac{{3 \cdot 2 \cdot 7 \cdot \textbf{2}}}{{8 \cdot \textbf{2} \cdot 5}}=- \frac{{3 \cdot \textbf{2} \cdot 7}}{{4 \cdot \textbf{2} \cdot 5}} = - \frac{{3 \cdot 7}}{{4 \cdot 5}}=-\frac{{21}}{{20}}=-1\frac{1}{{20}}$

$\displaystyle - \frac{2}{3} \cdot \left( { - 1\frac{1}{2}} \right) = - \frac{2}{3} \cdot \left( { - \frac{3}{2}} \right) = \frac{{\textbf{2} \cdot \textbf{3}}}{{\textbf{3} \cdot \textbf{2}}}=1$