\[\boxed{\mathbf{1285}\mathbf{\ (869)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\(1)\ 15,62 + x = 20\)
\[x = 20 - 15,62\]
\[x = 4,38\]
\[Ответ:4,38.\]
\(2)\ 9,54 - x = 7,268\)
\[x = 9,54 - 7,268\]
\[x = 2,272\]
\[Ответ:2,272.\]
\(3)\ x - 36,76 = 19,24\)
\[x = 19,24 + 36,76\]
\[x = 56\]
\[Ответ:56.\]
\(4)\ x + 0,24 = 8,1\)
\[x = 8,1 - 0,24\]
\[x = 7,86\]
\[Ответ:7,86.\]