8.1. = f (x) () :
) , f (x) = c, = const, Î ();
) , 1, 2 Î () 1 < 2 f (x 1) < f (x 2);
) , 1, 2 Î () 1 < 2 f (x 1) > f (x 2).
8.1. ( ).
, ; , ; , .
. y = f (x) (). 1, 2 Î () , 1 < 2.
f (x 2) f (x 1) = f '(c)(x 2 − x 1), Î ( 1; 2).
:
1) f '(x) > 0 (). f '(c) > 0, x 2 − x 1 > 0 f (x 1) f (x 2) > 0, . . f (x 1) < f (x 2). , f (x) ();
2) f '(x) > 0 (). f '(c) > 0, x 2 − x 1 > 0 f (x 1) f (x 2) < 0, . . f (x 1) > f (x 2). , = f (x) ();
3) f '(x) = 0 (). f '(c) = 0, f (x 1) f (x 2) = 0, . . f (x 1) = f (x 2).
, = f (x) ().
, . .
8.2. = = f (x), f (x), f (x) .
, = 2 = , = −¥, = +¥.
8.3. , = f (x) ( ) . .
=
= f (x),
f (x) = ,
→ +¥.
8.2. ( ).
= f (x) → +¥ = ,
, . (8.1)
. = f (x) = . f (x) = , = 0. ,
,
.
. (8.1). , . , → +¥. f (x) = = .
|
|
8.1. = .
= = , = .
.