35. f(x,y)=x6y4 (0,0)
x=0 y=0 |
(0,0) =0 >=0 : ( >=0)
36. f(x,y)=xy4 (0,0)
x=0 y=0 |
(0,0) = 0 : ( )
37. f(x.y)=x2-y2 (o,o)
x=0 y=0 |
=-4 <0 :
38. ) Fx=2x Fy=2y
(1,1) , (1,1) ( ).
) x+y=2. Y=2-x
f= x2+(2-x)2=2x2-4x+4
f=4x-4=0 x=1 =1 =2-1=1
39. 3 . 1) -1>0 2)x-1<0 3) x=0
.
: -3
40. : 32=9
72=49
: 32=9
72=49
72=49
(0, 0) ,
()=()
.
f() ( +1) E- 0. , 0,
f() = T() +
T(x)- - f() 0. -
.
=f (x), , X f() <= f(X).
y = f (X), , X f() >= f(X).
=f(X)
.
. f(x1,..., xm) . , 0, , f . 0 :
.
f(x1,..., xm), . 0. d2 f(M0) dx1,..., dxm, . 0 ( , d2 f(M0) , , d2 f(M0) ), d2 f(M0) , . 0 .
|
|
.
= f(X) D(f) S - D(f) (.. S D(f). A S f, , , S, f(A)<= f(B).
S f, , , S, f(A)>=f(B).
.
.
f g1 gs * ,
. * - f
ʎ1 ʎs x* -
L , .