1. , , . .
.
2. f (x) a,
.
3. f (x) [ a, b ], :
.
4. f (x) g(x) [ a, b ], , ,
.
5. f (x) [ a, c ] [ c, b ], [ a, b ],
.
. 7.3.
. 7.3.
. [ a, b ], .
6. f (x) [ a, b ], , c [ a, b ] ,
.
, . 7.4, .
. 7.4.
-
f (x) [ a, b ], , 6 . x [ a, b ]. f (x) [ a, x ] 5.
,
. , F 1(x) f (x) [ a, b ].
x x , x + x [ a, b ].
.
, [ x, x + x ].
.
, , F 1(x) f (x) [ a, b ].
- F (x) f (x).
F (x) = F 1(x) + C,
. . [ a, b ].
F (x) [ a, b ].
;
.
.
1 x , ,
,
-.
.
- , F (x) f (x).
, , f (x) [ a, b ]. , , - .
7.25.
:
1. .
2. .
3. .
4. .
7.5.
= f (x) [ , b ]. S = f (x) [ , b ]
|
|
.
, , .
7.26. , , = 0, = 4.
. , S :
S = S 0 S 0 ,
.
, = 4 (2; 4).
,
.
(2).
, , . [0; 4], :
16/3(.2).
= f (x) [ , b ].
= f (x):
, .. .
, = f (x) [ , b ], S = f (x) [ , b ] .
7.27. , , = 2, = 0.
. , S 0 0 [0; 2]. .
S = S 0 AB 0 , . S = S 0 AC + SABC.
, = 2. 1.
;
.
(.2).
[ , b ] y = f (x) . , , = f (x) .
S = S 1 + S 2 + S 3 :
.
, :
[ , b ] = f 1(x) = f 2(x), f 2(x) ≥ f 1(x). S , y = f 2(x) y = f 1(x), [ , b ]
. (7.1)
. [ , b ].
1. f 2(x) ≥ f 1(x) ≥ 0.
.
2. 0 ≥ f 2(x) ≥ f 1(x).
3. f 2(x) ≥ 0, f 1(x) 0.
.
4. ,
, [ , b ] [ , ],[ , d ],[ d, b ].
7.28. , = 2 2, = .
. = 2 = . , ( 1; 1) (2; 2).
|
|
[1; 2] ≥ 2 2. (5.1) :
(.2).
7.29.
, = 4 2, = 2 2 .
. = 4 2 = 2 2 : (1; 3) (2; 0).
, , [1; 2]. f 2(x) = 4 2 ≥ f 1(x) = 2 2 .
(5.1),
(.2).
7.30.
, y = 6 x x 2 0 x.
. y =6 x x 2 , . x 6 x x 2 = 0, . . x 1 = 0; x 2 = 6. , , , , .
,
(.2).
7.31.
, y = ex, x, y x = 2.
. ,
(.2).
7.32.
, y = x 2
y = x + 2.
. , S , x = x 1 x = x 2. x 1 x 2 , , :
; ;
; ; ; .
S
(.2).
7.6.
, .
, ( ) -.
.
.
,
,
f (x) dx
,
t = u (x).
,
α = u (a); β = u (b).
, -,
.
7.33.
.
7.34.
.
7.35.
.
y = f (x) [ a, t ], t > a.
= .
, .
, .
:
.
.
, . , .
, .
, .
, . 7.5.
,
. , . , .
|
|
, :
.
7.38.
.
7.39.
.
7.40.
.
7.41.