\[\boxed{\mathbf{1500}\mathbf{.}}\]
\[y = x^{2} \bullet e^{- x};\]
\[касательная\ в\ точке\ x_{0} = 1:\]
\[y^{'}(x) = \left( x^{2} \right)^{'} \bullet e^{- x} + x^{2} \bullet \left( e^{- x} \right)^{'} =\]
\[= 2x \bullet e^{- x} + x^{2} \bullet \left( - e^{- x} \right) =\]
\[= \left( 2x - x^{2} \right) \bullet e^{- x};\]
\[tg\ a = y^{'}(1) = \left( 2 \bullet 1 - 1^{2} \right) \bullet e^{- 1} =\]
\[= (2 - 1) \bullet e^{- 1} = \frac{1}{e}.\]
\[Ответ:\ \ tg\ a = \frac{1}{e}.\]