\[\boxed{\text{252.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[= 500 - 180\ :2 + 30 =\]
\[= 500 - 90 + 30 =\]
\[= 410 + 30 = 440.\]
\[= (90 + 17) \cdot (20 \cdot 5) =\]
\[= 107 \cdot 100 = 10\ 700.\]
\[= 100\ 000 - 66\ 740 = 33\ 260.\]
\[= 9\ 999 + 84\ 042 = 94\ 041.\]