, , , .
1) . , . , , . 2, r 1, r 2 r 9 ; r 7 r 8.
, n ,
r =r1+r2++rn=∑k=1nrk.r=r1+r2++rn=∑k=1nrk. (12)
2) . , . (. 2), r 45 = r 4 + r 5 r 10.
, n .
1r =1r1+1r2++1rn=∑k=1n1rk.1r=1r1+1r2++1rn=∑k=1n1rk. (13)
r 1 r 2
r =r1⋅r2r1+r2.r=r1⋅r2r1+r2. (14)
3) . . , r 1, r 2 r 3 (. 3) .
r =r1+r2,3=r1+r2⋅r3r2+r3.r=r1+r2,3=r1+r2⋅r3r2+r3. (15)
(. 3):
I1=Ur ,I1=Ur, (16)
( )
I2=I1⋅r3r2+r3, I3=I1⋅r2r2+r3.I2=I1⋅r3r2+r3, I3=I1⋅r2r2+r3.
4) (. 4, ) (. 4, )
⎧⎩⎨⎪⎪⎪⎪⎪⎪r1=r12⋅r31r12+r23+r31;r2=r23⋅r12r12+r23+r31;r3=r31⋅r23r12+r23+r31,{r1=r12⋅r31r12+r23+r31;r2=r23⋅r12r12+r23+r31;r3=r31⋅r23r12+r23+r31, (17)
⎧⎩⎨⎪⎪⎪⎪⎪⎪g12=g1⋅g2g1+g2+g3;g23=g2⋅g3g1+g2+g3;g31=g3⋅g1g1+g2+g3,{g12=g1⋅g2g1+g2+g3;g23=g2⋅g3g1+g2+g3;g31=g3⋅g1g1+g2+g3, (18)
g .
(18)
r12=r1+r2+r1⋅r2r3; r23=r2+r3+r2⋅r3r1; r31=r3+r1+r3⋅r1r2.r12=r1+r2+r1⋅r2r3; r23=r2+r3+r2⋅r3r1; r31=r3+r1+r3⋅r1r2. (19)
51.
( )
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I ab, r (. 5, , ), ( ) U (. 5, ). r, , , ... ( ) , a b (. 5, ; ).
r . 5, ,
r =U I ,r=UI, (20)
I , ab, r (. 5, ).
(. 5, ) ... E = U r = r, ab r (. 5, ).
, r,
I=U r+r . I=Ur+r. (21)
55 56.