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:
L=1.0l1+0.75l2.3+0.4l+1/20n (2.1)
1.0,0.75,0.4,1/20 - .
l1 ,l2.3 ,l ,n.- , .
24-30 . . : , .
:
L.= 1,75 (2+5.5+3+11.5+2)=24
Lc.=0,4 (7+3+8+3+9+4)=34
L.= (14+6+12+8+14+6)/20 =3
L.= (24+34+3)=61
, ,
l = 28
n.=61/28=2
. 1 , - .
l1=1.75*2+0.4*(7+3)+(14+6)/20=14.9
l2=1.75*3+0.4(8+3)+(12+8)/20=15.8
l3=1,75*2=0,4(9+4)+(14+6)/20=17,9