I iirl'ri_Ei:-4j: .,':irrr*iFFji.i: :j::,: rtinl H3& .$,.tt"il &L Dt"l ' Trucmg DHSP Tp.HCM OB rm rEr rHUc HQC pUAN Khoa Vat Ly . T€n hec phdn: OAf SO 2 (tenz) o0o Lo? : L!, l - Ctr nhdn Vat lli Thoi gian: 60 phft. Ndm hgc: 2007 - 2008 [r 4 -21 Bnil:(4rti€m)ChoA:l-t -l t I Lr 2 0J a) Tim tri ri6ng vd vecto ri6ng tuong ring cua ma trfln A. Ma tr6n A'c6 ch6o h6a dugc kh6ng? b) Cho .f (x) = (r - l)'*' . Tinh f (A) Biri 2: (3 <ti6m) NhQn d4ng vd bi€u di6n duong bQrc 2 c6 phuong trinh: 5 x2 + 26xy + s y' - l+Jl .x ;2J1.y- 86 = 0 trong hQ tga dQ vudng g6c Oxy. Bii 3: (3 diCm) a) Bi€u di€n midn tne tictr f Ui'eiOi han bdi mat cAu (C): x' + y' + 22 =3n2, rir6t hyperboloid (H): *' + y' - z' =R2 6lhAn '- z>0). !€6-*&r-!** . b)"Jir+,phrru+rg trinh cria hinh chi6u'(T) tr€n m{t phing€xy cta giao tuy6n criam{t (H) vbi m{tphing'(P): x +2y- z =0.Eudng cong (t) ld dudng gi trong mpt phing 6*t? ' Lr i r{ET Ghi cht: Sinh vi1n kh6ng duqc s* dpng.tdi li€u ,:. . phdn: OAf SO 2 (tenz) o0o Lo? : L!, l - Ctr nhdn Vat lli Thoi gian: 60 phft. Ndm hgc: 2007 - 2008 [r 4 -2 1 Bnil:(4rti€m)ChoA:l-t -l t I Lr 2 0J a) Tim tri ri6ng vd vecto. (x) = (r - l)'*' . Tinh f (A) Biri 2: (3 <ti6m) NhQn d4ng vd bi€u di6n duong bQrc 2 c6 phuong trinh: 5 x2 + 26xy + s y' - l+Jl .x ;2J1.y- 86 = 0 trong. y' + 22 =3n2, rir6t hyperboloid (H): *' + y' - z' =R2 6lhAn &apos ;- z>0). !€ 6-* &r-!** . b)"Jir+,phrru+rg trinh cria hinh chi6u'(T) tr€n