$\lim_{x\to-1}\left(\frac{3x^4-x^2}{e^x}\right)$

$2 \int 5 x ^ { 4 } d x$

$45x=180+40x$

$\left(\frac{2x^3y}{3a^2b^4}\right)^3\left(\frac{x^2y}{a^2b^4}\right)^0$

$\lim_{x\to1}\left(\frac{7}{x^2}\right)$

$\frac{125}{729}d^{18}+\frac{1000}{343}e^6$

$2\left(2x-2\right)^2-32$