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Culegere de probleme de Analiz˘a numeric˘a

Culegere de probleme de Analiz˘a numeric˘a

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10.2. Sisteme neliniare 161<br />

x1 −x0 [y1,y2;g]−[y0,y1;g]<br />

= x0 −f(x0) +f(x0)f(x1) =<br />

f(x1)−f(x0)<br />

x2 −x1<br />

y2 −y0<br />

= x0 − f(x0)<br />

[x0,x1;f] +f(x0)f(x1)<br />

f(x2)−f(x1) −<br />

x1 −x0<br />

f(x1)−f(x0)<br />

=<br />

f(x2)−f(x0)<br />

= x0 − f(x0)<br />

[x0,x1;f] −f(x0)f(x1)<br />

f(x2)−f(x1)<br />

x2 −x1<br />

− f(x1)−f(x0)<br />

x1 −x0<br />

x2 −x0<br />

x2 −x0<br />

·<br />

f(x2)−f(x0) ·<br />

x1 −x0<br />

f(x1)−f(x0) ·<br />

x2 −x1<br />

f(x2)−f(x1) =<br />

= x0 − f(x0) [x0,x1,x2;f]f(x1)f(x2)<br />

−<br />

[x0,x1;f] [x1,x2;f][x0,x2;f][x0,x1;f]<br />

10.2 Sisteme neliniare<br />

Problema 10.2.1 Utilizat¸i metoda aproximat¸iilor succesive pentru a aproxima<br />

solut¸ia sistemului<br />

<br />

2 x1 +x2 2 = 1<br />

(10.6)<br />

x 3 1 −x2 = 0<br />

Solut¸ie. Interpretarea geometrică apare în figura 10.5.<br />

1<br />

0.8<br />

0.6<br />

0.4<br />

0.2<br />

0<br />

−0.2<br />

−0.4<br />

−0.6<br />

−0.8<br />

−1<br />

−1 −0.5 0 0.5 1<br />

Figura 10.5: Interpretarea geometrică a sistemului (10.6)<br />

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