, y = f (x), .2. M L ML, . ML 0x φ.
.2. MN M
L M . ML MN, α 0x. MN , M L, MN M.
,
= f (x) x :
.
, .
1. C :
C = const; f (x) - , x.
2. ( ) ( ) x :
[u(x) ν(x)]' = u(x) v'(x).
v(x) u(x) - .
3. x u(x) v(x) :
[u(x)∙v(x)]' = u(x)v'(x) + u'(x)∙ν(x).
4. u(x) v(x) - x ,
v(x) ≠ 0. :
. y = f (x) x :
dy = f (x)∙Δx.
dy - ; f (x) - x; Δx - .
, x Δx. Δx x , . , f' () Δx.
. = 34.
: ' = 3∙44-1 = 123. dy : dy = 123 Δx.