\[\boxed{\ \mathbf{420\ (420)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 2 \cdot 328 \cdot 5 = 328 \cdot (2 \cdot 5) =\]
\[= 328 \cdot 10 = 3280\]
\[2)\ 125 \cdot 43 \cdot 8 = (125 \cdot 8) \cdot 43 =\]
\[= 1000 \cdot 43 = 43\ 000\]
\[3)\ 25 \cdot 243 \cdot 4 = (25 \cdot 4) \cdot 243 =\]
\[= 100 \cdot 243 = 24\ 300\]
\[4)\ 4 \cdot 36 \cdot 5 = (4 \cdot 5) \cdot 36 =\]
\[= 20 \cdot 36 = 720\]
\[5)\ 50 \cdot 236 \cdot 2 = (50 \cdot 2) \cdot 236 =\]
\[= 100 \cdot 236 = 23\ 600\]
\[6)\ 250 \cdot 3 \cdot 4 = (250 \cdot 4) \cdot 3 =\]
\[= 1000 \cdot 3 = 3000\]
\[\boxed{\mathbf{420}\mathbf{\ (385)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]