: . , . f() y=f(x) . .
y=f() f(). (Y)=(f(x))=f(x) . (y)=(f(x))=f() .
, , :
;
d2y, d2x ;
d3y, d3x ;
dny, dnx n -
x1 (max) f(x), d - 1
f(x)£f(x1)
2 (min) f(x), d- 2
f(x)³f(x2)
.
, . , , - .
( ). y=f(x) x0 , :
f(x0)= 0
: f(x) , y=f(x) .
, f(x) , .
( )
1. y=f(x) [a,b] (a,b), f(x) >0 xÎ(a,b), f(x) [a,b] ().
2. y=f(x) [a,b] (a,b), f(x) <0 xÎ(a,b), f(x) [a,b] (¯).
( ). f(x) , x0 , , , x0.
f(x) , x=x0 f(x) .
|
|
,
, x=x0 f(x)
X0 f(x) , f(x) .
,
x=x0 f(x) .
X0 f(x) , x=x0 .
| |||||||||
. ,
:
) , ) , )
.
)
: xÎRe
:
(1-X)(1+X)= 0, : x1= -1, x2= 1.
y
, = -1 ,
= 1
- ,
- .
)
=- 1 = 1,
:
2 = 0, : = 0.
, = 0 .
- .
)
= -1 = 1.
:
1 +2=0 , .