x 0, x, dy
df (x 0).
1.2.
1.3.
25. 1.1. ([1], 5, 10, . 1)
y = f (x) (a, b).
f (x) x
(a, b). f '(x) x (a, b).
f ' (x) ( )
f (x) f ''(x) y ''. , y ''= f ''(x) = ( f '(x))'.
26. 1.1. , . x y t: x = (t), y = (t).
, t,
x = (t) t = (x). y
x. y
x. .
27. 1.1. x = c , - c, f (c) , x f (c) ≥ f (x).
x = c , - c, f (c) ,
x f (c) ≤ f (x).
1.2.
.
1.3. (
). f (x) c
, f (c) = 0.
28. 1.1. . f (x)
. , , f (a) = f (b).
, f () .
1.2. . f (x) , , f (b) - f (a) = f ()(b- a).
1.3. . f (x) g (x)
, ,
g (x) ,
,
29. 1.1. . , :
- ;
- ;
- ,
.
30. 1.1. f (x) () x = c,
|
|
c, f (x) > f (c) x > c f (x) < f (c) x < c (f (x) < f (c) x > c f (x) > f (c) x < c).
1.2. f (x) c f (c) > 0 (f (c) <0),
() c.
1.3. , f (x)
( ) ,
() .
a,b f (x) (),
( ).
31. 1.1.
f (x) = 0.
, f (x) ,
.
1.2. ( ). x = c
f (x), f (x)
c. , f (x)
c c, f (x)
. f (x) c
c, f (x) .
, f (x) c, c
.
( ). x = c
f (x), f (x) c
. c ,
f (c) < 0, , f (c) >0.
1.3. . f (x) c,
, , c, c. ,
f (x) () c
() c, f (x)
().
1.4. ()
x 0, , x
f (x 0) ≥ f (x) (f (x 0) ≤ f (x)).
()
().
f (x) .
,
, ,
.
, ,
ci .
32. 1.1. .
. , y = f (x) (a, b) ,
(), ( )
|
|
.
. y = f (x) (a,b)
()
, (a,b) ,
().
1.2. .
. M (c, f (c)) y = f (x)
, x = c ,
c
.
1.3. .
f (x) x = c . ,
(c, f (c)) , f ''(c) = 0.
1.4. .
f (x) x = c,
c, , , c
f ''(x) c, (c, f (c))
.
33 . . x = a y = f (x), + - .
. y = kx + b y = f (x) x → x → , f (x) f (x) = kx + b + (x), (x)
x → x → .
34.
- . ( ).
- .
- , .
- , ( , , ).
- ( ) .
- -.
- .
- .