1) Δy ≈ y Δx = dy .
y(x0 + Δx) y(x0) = yΔx
y(x0 + x) = y(x0) = y(x0) + y(x0) (1)
(1), , y(x0), y(x0) y(x0 + Δx).
2) . , , . . .
.
: .
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, n=1,2,3...
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,
: y=f(x) [a,b], 1. f(x), x ϵ (a,b), 2. f(a) = f(b), Ǝ ϵ (a,b) f(c) = 0.
: 2- f(x) [a,b]. f(x), m f(x) [a,b].
1. M=m f(a)=f(b) f(x)=f(a)=f(b)=const f(x) = 0 ϵ(a,b).
2. M≠m f(x) () x=a(x=b) Ǝ cϵ(a,b) f(x) =max(min) . f(c) =0.
, =, [a,b], f(x) ox.
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,
f(x):
1. [a,b]
2. (a,b)
x=c [a,b] , f(b) f(a) = f '(c)(b-a)
x=c (a,b), f(x) , .
: F(x) =f(x) f(a) - (x-a) (1)
(1) . F(b)=F(a) F(b)=0, F(a)=0.
|
|
, ϵ(a,b), F(c) = 0.
F(x) = f(x) -
F(c) = f(c) => f(c) =
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