\centerline {\bf solutions}\bigskip 
\EX {1}{}
\QQ {1}
\hbox to 2cm{$(6!)²$,\hfil} $6^6×12^6$.
\QQ {2}
\hbox to 2cm{$4!×8!$,\hfil} $4^4×12^8$.
\QQ {3}
\hbox to 2cm{$2!2!4!4!$,\hfil} $2²×4²×6^4×12^4$.