For the formula 1 / F = / F1 + 1 / F2 (F2 ≠ 2f), if f and F2 are known, the deformation result of the formula is

For the formula 1 / F = / F1 + 1 / F2 (F2 ≠ 2f), if f and F2 are known, the deformation result of the formula is

1/f1=1/f2-1/F=(F-f2)/f2*F
f1=f2*F/(F-f2)

In the equation 1 / F = 1 / F 1 + 2 / F 2, F 2 ≠ 2F, the expression of F 1 is obtained

From the original equation: 1 / F1 = 1 / F-2 / F2
General score: 1 / F1 = (f2-2f) / (f · F2)
So F1 = (f · F2) / (f2-2f)
I don't need brackets when I write fractions. I just add brackets to make it clear

Definition of physical formula in grade two of junior high school

Physical quantity (unit) formula velocity V (M / s) v = s: distance / T: time gravity g (n) g = mg m: mass G: 9.8n/kg or 10N / kg density ρ (kg / m3) ρ = m / V M: mass V: Volume resultant force F (n) same direction: F = F1 + F2 opposite direction: F = F1-F2 opposite direction

The expression formula of physical electric power in the second grade of junior high school
In electric power, wqp always can't figure out which is which
The formula is not easy to understand. Many formulas in electric power are too confusing
Which great Xia can help me list all of them and indicate what they mean
All I will add points! Thank you!

1 W = 1 J / S = 1 V · a symbol meaning and unit W - electric energy - Joule (J) w - kilowatt * hour (kW * h) T - time - second (s) T - hour (H) P - power of electrical appliances - watt (W) P - kilowatt (kw) (two sets of units, according to different needs, select the appropriate unit for calculation)