Rendimento meccanico: differenze tra le versioni

<math> \frac {1-\eta '}{1-\eta} = k\frac{1}{\eta} \Rightarrow 1-\eta'={\frac{k}{\eta}}(1-\eta) \Rightarrow -\eta'= {\frac{k}{\eta}}- {\frac{k\eta}{\eta}}-1 \Rightarrow \eta' = {\frac{-k}{\eta}}+k+1 = {\frac{-k+k\eta+\eta}{\eta}}={\frac{-k(1+-\eta)+\eta}{\eta}}</math>