$2\left(-1\right)^3\left(2\right)+4\left(-1\right)^2\left(2\right)^2-\left(-1\right)+2$

$-207xy^2-53xy^2+206xy^2$

$\lim_{x\to\infty}3x^{-2}e^x$

$\frac{dy}{dx}=y\cdot\left(1-\frac{y}{4}\right)$

$\frac{\pi^{30}}{\pi^{18\cdot\pi^4}}$

$y=e^{1-x}$

$2x^2y^{-5}\cdot\left(x^{-2}y^{-4}\right)^4$