Ze wzoru l=2V/R+2r wyznacz zmienną r.
l = 2V/(R+ 2r) /* R+2r
l(R+2r) = 2V
lR + 2lr = 2V
2lr = 2V- lR /:2l
r = (2V-lR)/2l l≠0
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l = 2V/(R+ 2r) /* R+2r
l(R+2r) = 2V
lR + 2lr = 2V
2lr = 2V- lR /:2l
r = (2V-lR)/2l l≠0