$\frac{13}{129.87}=\frac{x}{209.79}$

$\frac{dy}{dx}\left(x^37y^3\right)=6xy$

$\left(-1\right)^3-\left(-3\right)^2\left(-2\right)-1\left(1-2\right)^3+3-2\left(-1\right)+4+3\left(-2\right)-\left(2\right)\left(-1\right)$

$\int\left(\sqrt{3\cdot x+1}\right)$

$-8m>-40$

$\left(\left(-16\right)\right)-\left(-5\right)-60$

$\left(1+x^2\right)dy-x^2ydx=0$