2.
1.1 .
y f(x)
A + e
A
A - e
0 a - D a a + D x
f(x) = (.. = )
. f(x) , e>0 D>0, , 0<ïx - aï<D
ïf(x) - Aï< e.
:
- D < x < a + D, x ¹ a, - e < f(x) < A + e.
:
. f(x) A1 x < a, - f(x) = , f(x) A2 x > a, f(x) = .
f(x)
2
1
0 a x
, f(x) = , .
1 2 f(x) = . , f(x).
12. .
. f(x) ¥, e>0 >0, , ïï>M
, f(x) .
:
:
y y
A A
0 0
x x
y y
A A
0 0
x x
>M
<M.
13. .
1. , = const.
, f(x) g(x) .
2.
.
3.
.
4.
5. f(x)>0 = , >0.
f(x) < 0, f(x) ³ 0, f(x) £ 0.
6. g(x) £ f(x) £ u(x) = , .
. f(x) = , >0, ïf(x)ï<M = .
7. f(x) , = .
. , .. ,
|
|
, ..
= e + ïï
.
.
2.1. .
. f(x) , ¥, +¥ -¥, .
. .
. f(x) = xn 0 1, .. .
. , f(x) , , , =
f(x) = A + a(x),
a() (a()0 ).
2.2. .
1) .
2) .
3) , = .
4) , .
, , .
2. f(x) = A + a(x), g(x) = B + b(x),
,
f(x) g(x) = (A + B) + a(x) + b(x)
A + B = const, a() + b() ,
.
3. f(x) = A + a(x), g(x) = B + b(x),
,
A×B = const, a() b() ,
.