\[\boxed{\mathbf{3.}\mathbf{245}}\]
\[1)\ 953\ 680\ :5\ :14\ :131 = 104\]
\[2)\ 125 \cdot (9720\ :81\ :6) =\]
\[= 125 \cdot 20 = 2500\]
\[120\ :6 = 20\]
\[3)\ 335\ 920\ :95\ :17 \cdot 125 =\]
\[= 26\ 000\]
\[4)\ 138\ 600\ :56\ :25\ :9 =\]
\[= 99\ :9 = 11\]