\[\boxed{\mathbf{Вариант\ 2.}}\]
\[\boxed{\mathbf{1.}}\]
\[1)\ \]
\[2)\ 6\ т\ 340\ кг \cdot 5 = 5\ т\ 1700\ кг =\]
\[= 6\ т\ 700\ кг\]
\[17\ м\ 8\ дм \cdot 6 = 112\ м\ 48\ дм =\]
\[= 116\ м\ 8\ дм\]
\[\boxed{\mathbf{2.}}\]
\[9 \cdot y = 100 - 28\]
\[9 \cdot y = 72\]
\[y = 72\ :9\]
\[y = 8\]
\[Проверка:\]
\[9 \cdot 8 = 100 - 28\]
\[72 = 72.\]
\[\boxed{\mathbf{3.}}\]
\[104 \cdot 9 = 936\]