\[\boxed{\mathbf{552\ (552).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 5\ :6 = 0,8(3)\]
\[2)\ 19\ :11 = 1,(72)\]
\[3)\ 86\ :15 = 5,7(3)\]
\[4)\ 6,32\ :18 = 0,35(1)\]
\[\boxed{\mathbf{552.}\mathbf{\ }}\]
\[1)\ (10,3 + 9,1)\ :2 =\]
\[= 19,4\ :2 = 9,7\]
\[2)\ (2,8 + 16,9 + 22)\ :3 =\]
\[= 41,7\ :3 = 13,9\]