Найдите значение суммы: 1/4+1/12+1/24+1/40+1/60+1/84.

\[\frac{1}{4} + \frac{1}{12} + \frac{1}{24} + \frac{1}{40} + \frac{1}{60} + \frac{1}{84} =\]

\[= \frac{1}{2} - \frac{1}{14} = \frac{7}{14} - \frac{1}{14} = \frac{6}{14} = \frac{3}{7}\]