:
P n(x)= A 0+ A 1(x - x 0)+ A 2(x - x 0)(x - x 1)+...+ A n(x - x 0)(x - x 1)...(x - x n-1) | (5.6) |
A 0, A 1, A 2,..., A n (5.3).
x = x 0. (5.6) , A 0, , ,
A 0 = f 0.
x = x 1, (5.3) :
f 0 + A 1(x 1- x 0)= f 1,
A 1:
A 1 = A 1 = f 01.
f 01 = . x 0 x 1 f (x), x = x 0.
x = x 2 (5.6) :
P n(x)= f 0+ f 01(x - x 0)+ A 2(x - x 0)(x - x 1),
(5.3) :
f 2 = f 0+ f 01(x 2- x 0)+ A 2(x 2- x 0)(x 2- x 1) f 2 - f 0- f 01(x 2- x 0) = A 2(x 2- x 0)(x 2- x 1),
, A 2:
A 2= = = = ,
. = f 012 ( ),
A 2:
A 2 = f 012 .
, x = x 3, A 3:
,
; .
A k (k=0,...,n) :
.
.
, ; .
, . : .
, , . , , ( ) f k. , : - F - . F , A 0, A 1, A 2,..., A n.
, , , .
A 0, A 1, A 2,..., A n x , (5.8) :
P n(x)= A 0+(x-x 0)(A 1+(x-x 1)(A 2+...+(x-x n-1) A n)...)).
.5.4 - .
x | f | |||||||||
x 0 | f 0 | = A 0 | ||||||||
x 1 | f 1 | f 01= | = A 1 | |||||||
x 2 | f 2 | f 02= | f 012= | = A 2 | ||||||
x 3 | f 3 | f 03= | f 013= | f 0123= | = A 3 | |||||
x 4 | f 4 | f 04= | f 014= | f 0124= | f 01234= | = A 4 | ||||
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