$168.-7.24+9.1$

$\left(2x\:+\:y^2\right)^2$

$-39\:+\:-18\:+\:1$

$\lim\:_{x\to\:0}\left(\frac{e^{x^2\left(x^2-2x+1\right)}}{arctan\left(x^2\left(4x^2+3x+1\right)\right)}\right)$

$2x^2-7x-3$

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

$\frac{d}{dx}\frac{5}{3}x^{\frac{3}{2}}+2x^{\frac{1}{2}}$