(130)
(. . ), . 3.61.
(130) (. . ),
) £ xR h 0
(131)
) > xR h 0 (131),
(132)
yc, xR, w . . 18 19;
ov ,
, (132), h hf (. . ), . ( = bf) (131) (132) b , (h + hf), Aov = (bf b)(h hf).
. hf .
3.68. .
(130) . 3.62.
(130) , x:
(133)
) x £ xR
(134)
) x > xR
(135)
x1 = x / h 0 (132),
(136)
(133)(136):
a n, a ov . . 3.67;
3.69. (. 38) r 1/ r 2³ 0,5 , ( 6), xcir.
(137)
. 38. ,
) 0,15 < xcir < 0,6
(138)
) xcir £ 0,15
(139)
(140)
) xcir ³ 0,6
(141)
(142)
(137)(142):
As,tot ;
rs , .
e 0 . 3.543.56.
3.70. , , . 3.69, rs rm . 39, :
(143)
|
|
(144)
. 39.