P
A, E
l
1 2A, E
2
l
l
P
P
S1 S2
3
1 ux
2
S3
= Ò! - + =
"
= Ò! - - - =
"
2
S1 = S2 = - P
2
3
1 1
Pix = 0 Ò! S1 + S3 = 0 S3 = P
"
2
2
S3l3 S3 2l 1 Pl
"l3 = = =
E3 A3 E2A 2 EA
podpory 1 skierowane w lewo i równe
1 Pl
ux = "l3 = .
2 EA