... SGD&THCHMINHTRNGTHPTTHCTHITHTHPTQUCGIANM2015Mụn:TONThigianlmbi:180phỳt,khụngkthigiangiaoCõu1(2im).Chohms ( ) ( )3 22 3 1y f x x x C = = - + +a)Khosỏtsbinthiờnvv th (C)cahms.b)Vitphngtrỡnhtiptuynca(C),bithonhtipimlnghimcaphngtrỡnh ... = + ỗ ữ ố ứ ũ.Cõu5(0.5im).TrongcucthiRungchuụngvng,iThccú20bnltvovũngchungkt,trongúcú5bnnv15bnnam.spxpvtrớchi,bantchcchiacỏcbnthnh4nhúmA,B,C,D ,minh mcú5bn.Vicchianhúmcthchinbngcỏchbcthmngunhiờn.Tớnhxỏcsut ... -.TỡmtacỏcnhA,BbitnhAcúhonh dng.Cõu8(1im). TrongkhụnggianvihtaOxyzchohaiim ( ) ( )1 12 , 30 4A B - -vmtphng(P) : x 2 y 2z 5 0 - + - = .TỡmtagiaoimcangthngABvmtphng(P).VitphngtrỡnhmtphngchangthngABvvuụnggúcvimtphng(P).Cõu9(1im).Giihphngtrỡnh...