$\frac{\left(-4m^3b\right)}{10mn^2}2$

$\left(1+x^2\right)\frac{dy}{dx}+4xy=\frac{1}{\left(1+x^2\right)^2}$

$\left(2\cdot16\right)-42+\left(9\cdot8\right)-4+3$

$\sqrt{\left(\left(-5\right)^3+2\left(-5\right)^2-8\left(-5\right)\right)}>\:0$

$x\cdot y=x+y-1$

$4\sqrt{625}$

$x^2+6x+25$