\[\boxed{\text{298.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[= 100 \cdot 1000\ :10 =\]
\[= 100\ 000\ :10 = 10\ 000.\]
\[= 100 \cdot 540 + 46 =\]
\[= 54\ 000 + 46 = 54\ 046.\]
\[= 100 \cdot (540 + 46) =\]
\[= 100 \cdot 586 = 58\ 600.\]
\[= 1\ 200 - 5 \cdot 5 \cdot 5 =\]
\[= 1\ 200 - 25 \cdot 5 =\]
\[= 1\ 200 - 125 = 1\ 075.\]
\[= 1\ 200 - 200\ :200 \cdot 5 =\]
\[= 1\ 200 - 1 \cdot 5 =\]
\[= 1\ 200 - 5 = 1\ 195.\]
\[= (1\ 200 - 5) \cdot 5 \cdot 5 =\]
\[= 1\ 195 \cdot 5 \cdot 5 =\]
\[= 5\ 975 \cdot 5 = 29\ 875.\]