: 2 3, 7 8, 5, 10. 6 7; .
(.3,), (.5). . b>350 ( ), , ( 40 ). .
(.3,), (.3,). , (.2,). () ( ), - (.5.15 [5]). , , , .
. , ( ). h³400 12 .
x ( xR), . , . .
, . :
h0=h-a; x ,
As , 2;
Rs , /2 (.2).
( .3).
, , , , 5 %.
. h0=70-8,6=61,4. am= =0,312. .3. .4, x=0,38+0,01
. 4. x
=0,387. As=0,387 25×61,4=25,232. . 3, .6, 4Æ28-III. , As,fact=24,63 2. , (28 ) (32 ), , .
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d=2,8 . ab=3,0 ;V1=6,0 ; =7,4 ; h0=62,6 ; am=0,3; x=0,367. As=24,39 2. , 4Æ28 AIII , 24,63 2. , , , .
. .3,. d=2, ab=2. V1=5 (..5), =2+0,5×2+0,5×5=5,5; h0=70-5,5=64,5, am= =0,161, x=0,17+0,01 =0,176. As=0,176 25×64,5=12,052. 4Æ20 AIII, As,fact=12,56 2.
. .3,. d=3,6, ab=4. =b+0,5d=4+0,5×3,6=5,8; h0=70-5,8=64,2, am= =0,224, x=0,25+0,01 =0,257. As=0,257 25×64,2=17,522. 2Æ36AIII, As,fact=20,36 2. 16%. ( .3,), .
d=2,8, ab=3,0. =3+0,5×2,8=4,4, h0=70-4,4=65,6, am= =0,215, x=0,24+0,01 =0,245. As=0,245 25×65,6=17,062. 2Æ28AIII+1Æ25AIII. s,fact=12,32+4,91=17,232. Æ28 , Æ25 .
. . 3,. h0 , , . , h0=65,6. am= =0,156, x=0,17. As=0,17 25×65,6=11,842. 2Æ28AIII, s,fact=12,32 2.
: 3 4 (..5,,); 12 13 ; 6 7 ; 16 17 ; 15 . .
. , .5, , 4-4 14. , .3, . . 5 a=a16+0,5d16+0,5d14, 16 ; d16 ; d14 14.
6 7 (166,1+99,7)/2=132,9×=13290000×. d14=2. =4,4+0,5×2,8+0,5×2=6,8, h0=70-6,8=63,2, am= =0,0859, x=0,09. As=0,09 25×63,2=6,042. 2Æ20AIII, s,fact=6,28 2.