,
,
3- :
σ
μ
As =,
3
μ - ;
σ 3 - .
.
k- :
N k
i
i
K n
(x x)
−
=
Σ=
μ - ;
k μ
=
Σ
Σ
=
−
=
m
i
m
i
k
i
I n
X x
()
.
:
n
x x i Σ −
=
()
μ - ;
Σ
Σ − ⋅
=
i
I i
n
X x 3 n
()
μ - .
:
(1) (3)
6 (1)
+ ⋅ +
⋅ −
=
N N
N
As σ.
AS
AS
σ
>3, .
.
.
4- 4
μ:
3 4
= 4 −
σ
μ
Ex,
4
μ - 4- .
N
X x
N
i
i Σ=
−
= 1
()
μ - ;
4 μ
=
Σ
Σ
=
=
− ⋅
m
i
i
m
i
I i
n
X x n
()4
- .
=0. >0,
, <0
.
.
:
x = 12 , =12,9 , δ =6,3 .
:
0,14
6,3
12 12,9 ≈ −
−
=
−
=
σ
As x Mo <0,
.
,
3- :
|
|
Σ
Σ − ⋅
= =
i
I i
n
X x n
As
3 ()
σ
μ:= 0,24
61,44
6,3
61,44
Gt;0.
,
.
3- 3
μ
5.6.
5.6.
3- 4-
i x i n x x i − (x x)3 i − i i (x − x)3 ⋅ n (x x)4 i − i i (x − x)4 ⋅ n
1 2 6 -10 -1000 -6000 10000 60000
2 6 8 -6 -216 -1728 1296 10368
3 10 11 -2 -8 -88 16 176
4 14 13 2 8 104 16 208
5 18 6 6 216 1296 1296 7776
6 22 4 10 1000 4000 10000 40000
7 26 2 14 2744 5488 38416 76832
14 50 - - 3072 - 195360
:
3 2,5 3 0,5
1575,3
6,3 3 3907,2
3 195360 4
4 4
= − = ÷ − = − = − = −
δ
μ Ex,
, .
, ,
,
, ,
.
,
,
. ,
.
,
. :
. ,
, .. Σ Σ
= =
≈
m
i
i
m
i
I T
N n
1 1
, iT n -
.
,
.