\[\boxed{\mathbf{535\ (535)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ (48 + a)\ :6\ \ \]
\[при\ \ a = 6:\]
\[(48 + 6)\ :6 = 54\ :6 = 9.\]
\[2)\ (65 - a)\ :8\ \ \]
\[при\ \ a = 1:\]
\[(65 - 1)\ :8 = 64\ :8 = 8.\]
\[3)\ (96 - a)\ :9 = x\ (ост.\ 4)\text{\ \ }\]
\[при\ \ a = 2:\]
\[(96 - 2)\ :9 = 94\ :9 =\]
\[= 10\ (ост.\ 4).\]