$\left(2a+3+2a^2+3a-5\right)+\left(-3a^2-5a^2+a\right)$

$\lim_{n\to\infty}\left(\frac{n^2}{n+1}\right)$

$\lim_{x\to\infty}\left(\frac{x^{3x}}{\left(x+1\right)^{3x}}\right)$

$\frac{d}{dx}\left(\left(x+y\right)^{0.5}=x\right)$

$x^2-6x+c=-5+c$

$679\cdot5$

$\frac{8^2}{8^{-2}}$