\[\boxed{\ \mathbf{438\ (438)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 43 \cdot 64 + 43 \cdot 23 - 87 \cdot 33 =\]
\[= 43 \cdot (64 + 23) - 87 \cdot 33 =\]
\[= 87 \cdot 43 - 87 \cdot 33 =\]
\[= 87 \cdot (43 - 33) = 87 \cdot 10 =\]
\[= 870\]
\[= 84 \cdot 25 + 16 \cdot 25 =\]
\[= 25 \cdot (84 + 16) =\]
\[= 25 \cdot 100 = 2500\]