TeX джерело:

\frac{{\Delta s}}{{\Delta t}} = \frac{{10{t_0}\Delta t + 5\Delta {t^2} + \Delta t}}{{\Delta t}} = \frac{{\Delta t(10{t_0} + 1 + 5\Delta t)}}{{\Delta t}} = 10{t_0} + 1 + 5\Delta t