„ RR,
Rn = Ri + Rl + ^
Ra =R2+Ri+R2p ''
i?31 =i?3 + ^3 1
Rl
a 4 (^r^2)4
°12 ~ ,4 j 4 , 4
“l +“2 +“3
4
31 d4+d2Ą+d3Ą
66