.: , .
.: , .
. .
, , .
y = f (x) f (x), , f (x) > 0, , f (x) < 0, .
y = f(x) f(x).
y = f(x)
1. f (x).
2. f (x) , .1 f (x).
:
= - 2 + 10 + 7
:
., .. D(y) = R
f(x). y¢ = -2 +10
y¢ ;
, y¢ = 0
-2 +10 = 0
-2 = -10
=5
, y¢ = 0 : ( ∞,5) (5,+ ∞), y¢ . y¢ , :
( ∞,5] y¢ > 0,
[5,+ ∞) y¢ < 0
( ∞,5] , [5,+ ∞) .
= 0 , y = f (x), 0, , 0 f (x) < f (x 0).
= 0 , y = f (x), 0, , 0 f (x) > f (x 0)..
.
1- ., .. f(x) = 0 .
, . :
x 0 f (x) +
, x 0 , x 0 f (x) - +, x 0 .
|
|
:
, .
= 3 62 + 9
., .. D(y) = R
f(x). y¢ = 3 2 12 +9
y¢ ;
, y¢ = 0
3 2 12 +9 =0
y¢ 0 1 = 1, 2 = 3,
, y¢ = 0 :
( ∞,1), [1,3] (3,+ ∞), y¢ . y¢ , :
( ∞,1] y¢ > 0,
[1,3] y¢ < 0
[3,+ ∞) y¢ > 0,
( ∞,1][3,+ ∞) , [1,3] .
=1 . =3 .
in . =3 =1
in=27-54+27=0
=1-6+9=4