\[\boxed{\mathbf{515\ (515)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 7 \cdot 9 + 12\ :(3 - 2) =\]
\[= 63 + 12\ :1 = 63 + 12 = 75\]
\[2)\ (7 \cdot 9 + 12)\ :3 - 2 =\]
\[= (63 + 12)\ :3 - 2 =\]
\[= 75\ :3 - 2 = 25 - 2 = 23\]
\[\boxed{\ \mathbf{515\ (455)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]