Задание

Найдите пропущенные числа:

\(\displaystyle \frac{1}{4}+\frac{4}{7}=\)
[ ]\(\displaystyle \cdot \,1\)
 
\(\displaystyle 7 \cdot 4\)
\(\displaystyle +\)
\(\displaystyle 4\, \cdot\)[ ]
 
\(\displaystyle 7 \cdot 4\)
\(\displaystyle =\)[ ]
 
[ ]