- .
- x0 f(x)=0, .
f(x)=0
x = φ (x) (15)
, , ,
x = x + c f(x) (16)
- .
x1 x0 (15), .. x1=φ(x0). , x2=φ(x1), x3=φ(x2),...,
xn+1=φ (xn) (17)
xn (n=1,2,3,...). (17) .
. ( - f(x)=0), [a,b] xn,
(18)
. x0 , A, .
(19)
(20)
1. x3 -5x+1=0.
. , , , [-3;-2], [0;1], [2;3]. [0; I]. , . , f(x)=x3 -5x+1, f(0)=1>0, , [0; 0,5]. (15), x:
..
, (18) , , (20).
, .. x0=0,25,
_1, , A= 0,20164, ε=0,0001, .. (20)
.
.. (18) . , , (18) [-3;-2], [2;3] .
2.
x4 + x -3 = 0
. ; [-1,5;-1,4],
(16):
x = x + c (x 4 + x 3)
- . , [-1,5;-1,4] (18). =0,1,
|
|
φ (x) = x + 0,1 (x4 + x 3),
.. (18).
x0=-1,45.
_2, , A=-1,45262 .
_2
: 2.2 3 ǹ1.