\[\boxed{\mathbf{923\ (923).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 6ab² - 12ab^{3} =\]
\[= 6ab\left( b - 2b^{2} \right) = 6ab²(1 - 2b)\]
\[2)\ 2a³ - 8a = 2a\left( a^{2} - 4 \right) =\]
\[= 2a(a - 2)(a + 2)\]
\[3)\ 3a²c - 3c^{3} = 3c\left( a^{2} - c^{2} \right) =\]
\[= 3c(a - c)(a + c)\]
\[4)\ 18mn² + 27m²n =\]
\[= 9mn(2n + 3m)\]
\[5)\ 100x² - 1 =\]
\[= (10x - 1)(10x + 1)\]
\[6)\ 2y² - 12y + 18 =\]
\[= 2 \cdot \left( y^{2} - 6y + 9 \right) = 2 \cdot (y - 3)²\]