Ответ:
\[a_{1} = 56;\ \ a_{2} = 50;\ \ a_{3} = 44:\]
\[d = a_{2} - a_{1} = 50 - 56 = - 6;\]
\[a_{12} = a_{1} + 11d = 56 - 11 \cdot 6 =\]
\[= 56 - 66 = - 10.\]
\[Ответ:\ - 10.\]
\[a_{1} = 56;\ \ a_{2} = 50;\ \ a_{3} = 44:\]
\[d = a_{2} - a_{1} = 50 - 56 = - 6;\]
\[a_{12} = a_{1} + 11d = 56 - 11 \cdot 6 =\]
\[= 56 - 66 = - 10.\]
\[Ответ:\ - 10.\]