$\sqrt{3a^2b}$

$225\:m^3n\:-\:400\:mn$

$\lim_{x\to a}\frac{\left(3x-x^2-\left(3a-a^2\right)\right)}{x-a}$

$\left(0.6\right)\left(0.09\right)^2$

$10x+25y-35$

$-\left(-3-5+6\right)-3+6-\left(-2\right)\cdot\:6+\left(-3\right)$

$\frac{dy}{dx}=\frac{2y}{x+1},\:y\left(0\right)=3$