() Po, , , .
. Po (. 118).
. 118.
30 .
, , ()
ѳ = +Po, (159)
C AB. C AB,
ѳ = -P0 (160)
³
C1. C1 , 1 . 䳿 . B . C
2 = ), (161)
(161) (+) C AB, (-) C AB.
³
.
C2. C1 C2, . C. AB AC P0.
- >2 ( - ). .
', . .
AM. (. 119). 3, 4, 5 6, 8, 10 9, 12, 15 . . ³ AM 3, 6 9 ' . ' , . 4, 8 12 , . . 900, .
D . (3*4*5; 6*8*10; 9*12*15; ..).