R . (.1.9). (.1.19) .
: ( n) .
.1.19 .1.20. .1.21.
, (1.5)
: (.1.20). Rx = F1 x + F2 x + F3 x, R x = å Fkx (1.6)
(1.6)
, (1.7)
x, y, z (.1.20)
1.7.2. .
, . .
: , , , , , , , (.1.22).
. , - . * , * - .
.1.22
: * * .
, (1.8)
. (1.9)
1.8
1.8.1.
(..1.1) . , = 0.
(1.7) , , X,Y,Z
å Fkx = 0
å Fky = 0 (1.10) å Fk z = 0
, X,Y
å Fkx = 0
å Fky = 0 (1.11)