, , , . , :
- f(x) [a; b] x1 x2 : x1 ≤ x2 ⇒ f(x1) ≤ f(x2). , , .
- f(x) [a; b] x1 x2 : x1 ≤ x2 ⇒ f(x1) ≥ f(x2). .. .
:
- f(x) [a; b], , , .. f(x) ≥ 0.
- f(x) [a; b], , , .. f(x) ≤ 0.
. , , :
- . , .
- . , f(x) ≥ 0, , f(x) ≤ 0 . x, .
- , , .
- . f(x), [−3; 7,5]. f(x). , .
. , [−3; 7,5], x = −1,5 x = 5,3. . :
(− 1,5) , . , :
−1 + 0 + 1 + 2 + 3 + 4 + 5 = 14.
: 14
- . f(x), [−10; 4]. f(x). .
. . [−10; 4] , : x = −8, x = −6, x = −3 x = 2. :
, .. , f(x) ≥ 0. : (−8; −6) (−3; 2). :
l1 = − 6 − (−8) = 2;
l2 = 2 − (−3) = 5.
, l2 = 5.