y = f (x) x 0. 0(x 0, 0),
.
, a (. 2.1).
, , , .
: , y = f (x) x 0 .
: :
V (t)= x / (t). (2.1)
, , .. :
a (t)= V / (t)= x // (t). (2.2)
1. ¢ = 0,
2. (xm)¢ = mxm 1
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u v , .
1. :
(u + v) ′= u ′+ v ′
2. :(uv) ′= u ′ v + uv ′, (Cu) ′= Cu ′, = const ( )
3. :
, v ¹ 0
4. , : y ′ x=y ′ u · u ′ x, .
f ′ (x) f (x) . f ′ (x) x, f (x) ( ).
: f ′′() (: ) ( ).
, : .
:
= ..
- .
f () 0,
Δf ( 0) = f /(x 0)× Δ + α (Δ)× Δ. (2.3)
f / (x 0)× Δ, Δ, f () 0 df (x):
df (x) = f '(x 0) Δx.
|
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differentia, .
. .
dx ∆x: dx = ∆ x. df = f / (x) dx ( ).
∆x ( ), Δf , .. Δf df, f ( 0 + ∆ x) ≈ f / (x 0) + df
f ( 0 + ∆ x) ≈ f /(x 0) + f / (x 0) ∆ x (2.4)
(2) f (x) x 0+ ∆x x 0.