Упрости выражения

\(6a(x+3y)=\) [ \(ax+18y\) | \(6ax+18ay\) | \(6x+3ay\) ];

\(2x(x+4-4y)=\) [ \(2x+8-8y\) | \(x^2+8x-8y\) | \(2x^2+8x-8xy\) ];

\(8c(-3a-b+1)=\) [ \(-24ac-8bc+8c\) | \(-8a-8b+1c\) | \(-24ac-8b+8c\) ].