\[\boxed{\text{182.}}\]
\[Правильно.\]
\[Неправильно.\]
\[Неправильно.\]
\[\boxed{\text{183.}}\]
\[1)\ 255 + 45 = 300\]
\[300 - 30 = 270\]
\[270 + 68 = 338\]
\[338 - 20 = 318.\]
\[2)\ 126 + 64 = 190\]
\[190 - 50 = 140\]
\[140 + 294 = 434\]
\[434 - 34 = 400.\]
\[\boxed{\text{184.}}\]