:
:
(1) , n . , n , . , (2)*, . , ,
, 3,4,5, , , 2: : (3)*
, , (2) (3): , ( ) , , e. ..
, x, x, , . :
1. x : , x. => =>
, ,
( )
2. . − x = t,
, x.
:
9 .) . .
a(x) b(x) .. x x 0.
.
1) a(x) b (x)
: a(x) = o(b(x)).
2) a(x) b(x) ,
Îℝ C ¹ 0.
: a(x) = O (b(x)).
3) a(x) b(x) ,
: a(x) ~ b(x).
4) a(x) k -
b(x), a(x) (b(x))k , ..
Îℝ C ¹ 0.
6 ( ).
a(x), b(x), a1(x), b1(x) .. x x 0. a(x) ~ a1(x), b(x) ~ b1(x),
: a(x) ~ a1(x), b(x) ~ b1(x),
=
7 ( ).
a(x) b(x) .. x x 0, b(x) .. a(x).
= , a b(x) a(x), , .. , a(x) + b(x) ~ a(x)
10) ( -,) . , . .
1.
f (x) x 0.
|
|
1. f (x) x 0
.
1) 5 3 (1)
(2) .
2) (1) :
: x 0, .
2 ( e-d).
f (x) x 0 "e>0 $d>0 ,
x ÎU(x 0, d) (.. | x x 0 | < d),
f (x)ÎU(f (x 0), e) (.. | f (x) f (x 0) | < e).
x, x 0 Î D (f) (x 0 , x )
: D x = x x 0
D f (x 0) = f (x) f (x 0) x 0
3 ().
f (x) x 0 , ..
f (x) [ x 0; x 0 + d) ( (x 0 d; x 0]).
. f (x) x 0 (),
, f (x) x 0 Û f (x) x 0 .
. f (x) (a; b) .
f (x) [ a; b ] (a; b) (.. a , b ).
11) ,
. f (x) x 0, , f (x) x 0, x 0 f (x).
.
1) f (x) x 0.
.
2) Þ x 0 f (x) :
) U(x 0, d)Î D (f), f (x)
) U*(x 0, d)Î D (f).
).
x 0 f (x).
. x 0 I f (x) .
, x 0 , .
. x 0 II f (x) ¥ .
12) , [a,b]( ( -)
f(x) [a,b],
1)f(x) [a,b]
2)f(x) [a,b]
: m=f[x1] , m≤f(x) x D(f).
m=f[x2] , m≥f(x) x D(f).
\ .
|
|
f(x3)=f(x4)=max
.
f(x) [a,b] , f(a) f(b), 0[a,b] , f(x0)= g
:
, f(a)<f(b)
[a,b] [a,c] [c,b]
f(c)= g, 0=
f(c)> g, 0 [a,c]
f(c)< g, 0 [c,b]
f(x)< g +
f(x)> g -, [a,b]
ab , [a1,b1], f(a1)< g<f(b1). a1b1 , , g, - a2b2 ..
, .
, 0, .
, f(x0)= g:
2 : {an} ; {bn} - , =>
{f(an)} {f(bn)}
f(an)< g<f(bn), n,
, f =f(x0)
: f(x0)≤ g≤f(x0), .. g=f(x0)