\[\boxed{\text{195.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[= 24\ 570\ :90 = 273.\]
\[= 15\ 840\ :80 = 198.\]
\[= 4\ 800 - 100 + 2 =\]
\[= 4\ 700 + 2 = 4\ 702.\]
\[= 4\ 800 - 800\ :10 =\]
\[= 4\ 800 - 80 = 4\ 720.\ \]