\[\boxed{\ \mathbf{421\ (421)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 4 \cdot 17 \cdot 25 = (4 \cdot 25) \cdot 17 =\]
\[= 100 \cdot 17 = 1700\]
\[2)\ 5 \cdot 673 \cdot 2 = (5 \cdot 2) \cdot 673 =\]
\[= 10 \cdot 673 = 6730\]
\[3)\ 8 \cdot 475 \cdot 125 =\]
\[= (8 \cdot 125) \cdot 475 =\]
\[= 1000 \cdot 475 = 475\ 000\]
\[4)\ 73 \cdot 5 \cdot 4 = 73 \cdot (5 \cdot 4) =\]
\[= 73 \cdot 20 = 1460\]
\[5)\ 2 \cdot 916 \cdot 50 = (2 \cdot 50) \cdot 916 =\]
\[= 100 \cdot 916 = 91\ 600\]
\[6)\ 5 \cdot 9 \cdot 200 = (5 \cdot 200) \cdot 9 =\]
\[= 1000 \cdot 9 = 9000\]
\[\boxed{\mathbf{421}\mathbf{\ (386)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]