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Numerical Mathematics - A Collection of Solved Problems

Numerical Mathematics - A Collection of Solved Problems

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368 PRIBLIŽNO REŠAVANJE OBIČNIH DIFERENCIJALNIH JEDNAČINAk x k y k y(x k ) z k z(x k )0 1.0 0.3333333 0.3333333 1.0000000 1.00000001 1.1 0.3709342 0.3709341 1.0362694 1.03626942 1.2 0.4188979 0.4188979 1.0791367 1.07913673 1.3 0.4808936 0.4808936 1.1299436 1.12994354 1.4 0.5623944 0.5623943 1.1904763 1.19047625 1.5 0.6718182 0.6718181 1.2631581 1.26315786 1.6 0.8225904 0.8225905 1.3513514 1.35135157 1.7 1.0370675 1.0370678 1.4598541 1.45985418 1.8 1.3544686 1.3544689 1.5957446 1.59574479 1.9 1.8481333 1.8481344 1.7699113 1.769911610 2.0 2.6666656 2.6666667 1.9999998 2.000000011 2.1 4.1441259 4.1441321 2.3166018 2.316602912 2.2 7.1444836 7.1444917 2.7777767 2.777777913 2.3 14.3993673 14.3994160 3.5087693 3.508773814 2.4 37.7629280 37.7631035 4.8387012 4.838710815 2.5 170.6634674 170.6666718 7.9999280 8.0000000Korišćenjem metoda (6), a s obzirom da je na osnovu (5), y 0 = 1/3, z 0 = 1,f 1 (x, y, z) = xyz, f 2 (x, y, z) = xy/z, uzimajući h = 0.01, dobijamo rezultate prikazaneu tabeli za x = x k = 1 + 0.1 · k (k = 0,1, . . . ,15). Pored¯enja radi, u tabelisu date i odgovarajuće vrednosti za tačna rešenja Cauchyevog problema (2) kojasu data sa72y(x) =(7 − x) 3 , z(x) = 67 − x 2 .

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