1. 1
( 1, 2, , ) z. , z = f ( 1, 2, , ).
. z = 1 2 3 1, 2, 3.
. , ( 1, 2, , ), , z = f ( 1, 2, , ), . f:
1.
,
2.
n = 2
z = f (x, y) x, y.
. z = f (x, y) , . . x = x 0 z = f (x 0, y) y = y 0 z = f (x, y 0).
z = f (x, y) R 3, z z = f (x, y).
, z = f (x, y) R 3 (. 17).
. 17
z = f (x, y) x
= = ,
= = .
: , , , , , .
.
z = f (x, y) (, ) , , .
z = f (x, y) (x, y),
,
, , ; , , , = = 0.
z = f (x, y) , , , . . .
, , , .
z = f (x, y)
.
. z = x 2 y :
, , dz = 2 xy dx + x 2 dy.
1. ?
|
|
2. ?
3. ?
4. z = f (x, y) ?
5. (x, y)?
6. z = f (x, y)?
7. ?
1
, = ln(x 2 y 2) .
. :
= = = ,
= = ln(x 2
y 2) + = ln(x 2 y 2) .
:
= +
+ = , .
2. 2 3
,