Document3

TRNG I HC CNG NGHIP TP HCM

Khoa Khoa Hc C Bn

THI CUI K MN PHNG PHP TNH

Lp:DHCQ HOC LAI Ngy thi:

Thi gian: 60 pht :

Cu 1. Gii h phng trnh sau bng phng php Seidel (lp ba bc, bc ba c

nh gi sai s)

25 26

20 21

3 10 4

x y z

x y z

x y z

Cu 2. Bng s liu sau y cho ta bit s dn nc M (triu ngi) trong khong thi

gian t nm 1900 ti nm 2000:

t f t t f t

1900 76 1960 179

1910 92 1970 203

1920 106 1980 227

1930 123 1990 250

1940 131 2000 275

1950 150

S dng phng php bnh phng b nht, xc nh ,a b ng thng y at b l

xp x tt nht bng gi tr trn. Vi kt qu tm c, hy d on dn s nc M vo

nm 2010.

Cu 3. Error function (hm li) 2

0

2 x tE x e dt

c nhiu ng dng trong xc sut,

thng k v k thut. Bng cch s dng cng thc Simpson 1/3 vi s on chia

10n , cc bn hy tnh gn ng 1E .

Cu 4. Gii phng trnh vi phn Cauchy

2 23 , 0;0,02

0 1

y x y x

y

bng phng php Euler ci tin, ci tin 3 bc vi 0,01h .

B mn Ging vin ra