Question

(1/4+1/6)*(2/5-1/2) ​

Answer 1

Решение и ответ:

$\displaystyle \left( {\frac{1}{4} + \frac{1}{6}} \right) \cdot \left( {\frac{2}{5} - \frac{1}{2}} \right) = \left( {\frac{3}{{12}}+\frac{2}{{12}}} \right) \cdot \left( {\frac{{2 \cdot 2}}{5} - \frac{{1 \cdot 5}}{2}} \right)=\left( {\frac{3}{{12}}+\frac{2}{{12}}} \right) \cdot \left( {\frac{4}{{10}}-\frac{5}{{10}}} \right)=\left( {\frac{{3+2}}{{12}}} \right) \cdot \left( {\frac{{4 - 5}}{{10}}} \right)=\frac{5}{{12}} \cdot \frac{{-1}}{{10}}=-\frac{1}{{24}}$