\[\boxed{\mathbf{1053\ (1044)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ x(x + 9,4)(x - 6,5) = 0\]
\[x = 0\ \ \ \ \ \ \ \ x + 9,4 = 0\ \ \ \ \ \ \ \]
\[\ x - 6,5 = 0\]
\[\ x = - 9,4\ \ \ \ \ \ \ \ \ \ \ \ x = 6,5.\]
\[Ответ:\ - 9,4;\ \ 0;\ \ 6,5.\]
\[2)\ (x - 21)(x + 12,4) = 0\]
\[x - 21 = 0\ \ \ \ \ \ \ \ \ \ \ x + 12,4 = 0\]
\[x = 21\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = - 12,4.\]
\[Ответ:\ - 12,4;\ \ 21.\]