$3hd^2-2h^2-5d^2h+4h^2$

$302.5^2$

$\frac{d^4y}{dx^4}=x^2-2x^3-4x^2-5x+2$

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

$\frac{2^3}{2x^2}$

$12\left(\frac{1}{1}\right)\left(\frac{600}{1}\right)\left(\frac{480}{1}\right)\left(\frac{1}{60}\right)$

$\left|\left(+6\right)-\left(-8\right)\right|-\left|\left(-4-\left(-10\right)\right)\right|$