\[\boxed{\mathbf{1302}\mathbf{\ (891)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\(1)\ (1,34 + x) - 58,3 = 4,26\)
\[1,34 + x = 4,26 + 58,3\]
\[x = 62,56 - 1,34\]
\[x = 61,22\]
\[Ответ:61,22.\]
\(2)\ (94,2 - a) - 1,26 = 3,254\)
\[94,2 - a = 3,254 + 1,26\]
\[a = 94,2 - 4,514\]
\[a = 89,686\]
\[Ответ:89,\ 686.\]
\(3)\ 4,75 - (x - 0,67) = 3,025\)
\[x - 0,67 = 4,75 - 3,025\]
\[x = 1,725 + 0,67\]
\[x = 2,395\]
\[Ответ:2,395.\]
\(4)\ 40,3 - (63,4 - a) = 36,62\)
\[63,4 - a = 40,3 - 36,62\]
\[a = 63,4 - 3,68\]
\[a = 59,72\]
\[Ответ:59,72.\]