⇢ 
Олег Тутаров
Елена
Так:
R = ρl/S; S = πd/4; d = 2√(ρlR/π) = ...
ρ = 10^(-6); l = 4.8; R = 24; π = 3.14;
Так:
R = ρl/S; S = πd/4; d = 2√(ρlR/π) = ...
ρ = 10^(-6); l = 4.8; R = 24; π = 3.14;