Question

Alguém sabe terminar a conta?

Vm= ????

Answer 1

Vm = $\displaystyle\frac{2d}{\frac{d}{v_{1}}+\frac{d}{v_{2}}}$
Vm = $\displaystyle\frac{2d}{\frac{dv_{2}}{v_{1}v_{2}}+\frac{dv_{1}}{v_{1}v_{2}}}$
Vm = $\displaystyle\frac{2d}{\frac{d(v_{2}+v_{1})}{v_{1}v_{2}}}$

Vm = $\displaystyle\frac{2v_{1}v_{2}}{v_{2}+v_{1}}$