\[\boxed{\mathbf{Вариант\ 1.}}\]
\[\boxed{\mathbf{1.}}\]
\[\boxed{\mathbf{2.}}\]
\[Проверка:\]
\[60 \cdot 53 + 30 = 3180 + 30 = 3210\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \]
\[86 \cdot 700 + 100 =\]
\[= 60\ 200 + 100 = 60\ 300\]
\[\boxed{\mathbf{3.}}\]
\[40 \cdot 20 + 200 = 1000\]
\[1300 - 30 \cdot 20 = 700\]