\[\boxed{\ \mathbf{1413}.\ }\]
\[1)\ 50 - (2,3256\ :0,068 + 9,38) =\]
\[= 6,42\]
\[2,3256\ :0,068 = 23\ 256\ :680 =\]
\[= 34,2\]
\[34,2 + 9,38 = 43,58\]
\[50 - 43,58 = 6,42\]
\[6,63\ :0,85 = 663\ :85 =\]
\[3,0752\ :0,62 = 30\ 752\ :6200 =\]
\[= 4,96\]
\[7,8 - 4,96 = 2,84\]
\[40,88 - 4,94 = 35,94\]
\[57,6\ :18 = 3,2\]
\[3,2 + 2,8 = 6\]
\[35,94\ :6 = 3594\ :600 = 5,99\]