21 (2)
: : , , , , .
)
19, , = f (x), = , = b [ a, b ] . f (x) £ 0 [ a, b ], .
= f (x) , , , , , . , , , .
= f 1(x) = f 2(x), f 1(x)£ f 2(x), , .9, b D b, . ,
.
, , 10, : S = ( !). , , 10,?
, . , . , , 11,
S = .
y = f (x), , , t Î [a, b], j(a)= , j(b) = b, .. = .
.
)
= f (x). , [ a, b ]. . = 0,1, 2, ..., = (.14), 1, 2,..., Î [ a, b ].
D li , l = . D li , , i -1, M i . i -1(i -1, f (xi -1)), M i (i, f (xi)).
.
. i xi -1 =D i,
l = ,
l = .
, = f (x), [ a, b ],
l = , (1)
, t Î[a, b], .. y (t) = f (x (t)), (1) :
l = .
, , , t Î[a, b],
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) .
|
, , = j(), y = c, y = d [ c, d ] (.15):
19 , , l = b a, r = f (x), f (x) ³ 0, .
.
1. , R. r.
. . R, (.17). . , Ai i - . [0, H] . , i , D ( dx). i.
Ai ixi, ,
i =rgV i = rgpR2 dx, i , V i . Ai ixi = rgpR2 dx.i ,
, , , .
2.
) , ;
) , ;
) l , ;
) l , .
. , J = mr 2, .
) , , . R, , r.
, Ji i - .
i - ( ). R l. i, i = rV i rS = 2prR dxi, i Î[0, H]. Ji R2prR dxi,
.
r , J = 2prR3, = 2prR, J = R2.
) (), . , . [0, R] R i. i - : i = rV i,
V i = pR i 2 pR i- 12 = p(R i 2 R i -12) =
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= p(R i R i -1)(R i +R i -1).
, , , R i +R i -1 2R i, R i R i -1 = DR i, V i p2R i DR i, i rp×2R i DR i,
.
) l, r. .
, . , , ri = i. , . , ,
.
) , .. . , ri = i, , , , .
3. r b, , .
.
. , [0; a ] ( ), , b [0; b ] . , .
, S, r, h, ( ). .
[0; b ] . , , , ( ) i, , .. .
.
F , F ,
.
4. /. , 10 .
.
, . . , , .. .