$\left(-4\right)\left(4-2+5\right)-1-1-\left(8+\left(-3-1\right)-\left(-7+4\right)\right)+3-4$

$\int x^2\left(5+2x^3\right)dx$

$\lim_{x\to4}\left(\frac{\sqrt{1+x+x^2}-1}{x}\right)$

$-\left[-6+8\right]:\left(-2\right)$

$\left(\sqrt{x}\right)\left(3\sqrt{2x^2}\right)$

$2x^2+3xy^3-5=0$

$\int\left(4+x^2\right)^{-7}dx$