\[\boxed{\ \mathbf{423\ (423)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 12 \cdot 3x = 36x\]
\[2)\ 10x \cdot 6 = 60x\]
\[3)\ 5a \cdot 7b = 35ab\]
\[4)\ 8m \cdot 12n = 96mn\]
\[5)\ 2a \cdot 3b \cdot 4c = 24abc\]
\[6)\ 5x \cdot 2y \cdot 10z = 100xyz\]
\[\boxed{\mathbf{423}\mathbf{\ (387)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 412 \cdot 42 - 7304 = 10\ 000\]
\[2)\ 85 \cdot (870 - 567) = 25\ 755\]
\[3)\ (294 + 16) \cdot (348 - 279) =\]
\[= 21\ 390\]
\[4)\ 294 + 16 \cdot 348 - 279 = 5583\]
\[5)\ (294 + 16) \cdot 348 - 279 =\]
\[= 107\ 601\]
\[6)\ 294 + 16 \cdot (348 - 279) =\]
\[= 1398\]