F' : ?' f'-Fiic#r:*-F-e#W'q€4g{1 i{r€*.: .e%]rn:{F : TNTTMg D$ hgC Srr PhgM IP.HC*I C9NG HOA XA rrgl CHU NGffiA YIET NAM KHOA VAT Lf DO" iAp - Tr; do - Hsnh ph{c un runM TRA GrttA HQC pnAN vrON: ToAN GrAr ricu 2 -L6p r,f r cx Thdi gian: 120' Bai 1: Cho hdm s6 hai bi6n: , - *."% . Tinh dz( 1 ,0) vir A : *t io + 2xyz o + y2 )o Bai 2: Dtng vi ph6n him hai biiin tinh g*n dtrng: A: Jt."o,ou * (2"0f Huong ddn: chqtr X0 , ]s, Ax, Ay. Sau d6, Tim vi ph6n cua hd,ryn hai bi6n tai (xo, ys). R6i dirng y nghia cria vi phan vd th6 Ax, Ay vao ae c6 kdt qu6. Bei 3: cho z: (u), u: arctg-, rong clo (u) ld hdm kh6 vi diin c6p 2. r- xy rinh: A= z* * rlr r[r+ r i7 rrl Bai 4: Hdm s6 z: z (x, y) 6u99 x6c <tinh boi phucmg trinh: *2 +y'* 1t:y^@y/;> Chfmg minh t*g, (rt - y2 - r2)r, *zi;, Zxz BAi 5: Tim cgc tr! itla phuong cria hdrn s6: z: x'* yt - l2x + l6y trong miAn xt + y2S 25. a HET___ Ghi chrt: sinh vi4n kh6ng itrcgc trao ddi vd kh6ng sic dyng tdi liQu . 1t:y^@y/;> Chfmg minh t*g, (rt - y2 - r2)r, *zi;, Zxz BAi 5: Tim cgc tr! itla phuong cria hdrn s6: z: x'* yt - l2x + l6y trong miAn xt + y2S 25 . a HET___ Ghi chrt: sinh. ToAN GrAr ricu 2 -L6p r,f r cx Thdi gian: 120 ' Bai 1: Cho hdm s6 hai bi6n: , - *."% . Tinh dz( 1 ,0) vir A : *t io + 2xyz o + y2 )o Bai 2: Dtng vi ph6n. F' : ?' f'-Fiic#r:*-F-e#W'q€4g{1 i{r€*.: .e%]rn:{F : TNTTMg D$ hgC Srr PhgM IP.HC*I C9NG HOA XA rrgl CHU NGffiA YIET NAM KHOA VAT Lf DO" iAp - Tr; do - Hsnh ph{c un