1.
F1r1 =F2r2
r1 =F2r2/F1
---------------
F2 =F1r1/r2
2.
c =(f x s)/4d
f x s =4dc
s =4dc/f
-------------
f =4dc/s
3.
1/x +1/y =1/f
(y+x)/xy =1/f
f(x+y) =xy/:(x+y)
f =xy/(x+y)
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1.
F1r1 =F2r2
r1 =F2r2/F1
---------------
F2 =F1r1/r2
---------------
2.
c =(f x s)/4d
f x s =4dc
s =4dc/f
-------------
f =4dc/s
-------------
3.
1/x +1/y =1/f
(y+x)/xy =1/f
f(x+y) =xy/:(x+y)
f =xy/(x+y)
---------------