Question

va rog calculati ...
$\frac{1}{3 \times {7}^{2} } + \frac{1}{7 \times {3}^{2} } + \frac{1}{ {3}^{2} \times {7}^{2} } =$
Va implor !!!☺☺☺☺☺☺

Answer 1

Sper sa se vada clar ....