Question

ayudenme a despejar f de 1/f=1/do+1/di

Answer 1

$\frac{1}{f} = \frac{1}{do} + \frac{1}{di} \\ \\ \frac{1}{f} = \frac{di + do}{di \times do} \\ \\ f = \frac{di \times do}{di + do}$