z=e^2x-y的二阶偏导

∂z/∂x = 2e^(2x-y) ∂²z/∂x² = 4e^(2x-y)

∂z/∂y = -e^(2x-y) ∂²z/∂y² = e^(2x-y)

∂²z/∂x∂y = -2e^(2*x-y)

综上所述，z=e^(2x-y)的二阶偏导数为： ∂²z/∂x² = 4e^(2x-y) ∂²z/∂y² = e^(2x-y) ∂²z/∂x∂y = -2e^(2x-y)