\[\boxed{\mathbf{756\ (756)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[Пусть\ a - искомое\ число,\ \]
\[тогда:\]
\[a\ :7 = x\ (остаток\ x) \Longrightarrow\]
\[\Longrightarrow a = 7x + x\]
\[при:\]
\[x = 1 \Longrightarrow a = 8;\]
\[x = 2 \Longrightarrow a = 16;\]
\[x = 3 \Longrightarrow a = 24;\]
\[x = 4 \Longrightarrow a = 32;\]
\[x = 5 \Longrightarrow a = 40;\]
\[x = 6 \Longrightarrow a = 48.\]
\[Ответ:числа\ 8,\ 16,\ 24,\ 32,\ 40,\ 48.\]
\[\boxed{\mathbf{756}\mathbf{\ (584)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[a_{кв} = 12\ см;\ \ \ a_{пр} = 18\ см;\ \]
\[\ S_{кв} = S_{пр}\]
\[S_{кв} = a^{2} = 12^{2} = 144\ см^{2}.\]
\[S_{пр} = ab = 18 \cdot b = 144\ см^{2}.\ \]
\[b = 144\ :18 = 8\ см.\]
\[P_{пр} = 2 \cdot (a + b) =\]
\[= 2 \cdot (18 + 8) = 2 \cdot 26 = 52\ см.\]
\[Ответ:52\ см.\]