$+9+10-11-1+18+6+4+4$

$3x^2-20x+100$

$+696+18-21+56-32+50$

$\frac{dy}{dx}=\sqrt{x^4-x^4y^2}$

$\:\left(-3\right).\left(+5\right).\left(-7\right).\left(9\right)=abc$

$\left(2\right)\left(4m^3\right)\left(\frac{n^4}{4}\right)$

$\int_1^{+\infty}\left(\frac{9}{1+x^2}\right)dx$