... CBIH450TrngTHPTchuyờnLngVnChỏnhTTHHIITTHHTTUUYYNNSSIINNHHIIHHCCNMHC20092 010 MễN TON -KHIBThigianlmbi:180phỳt(khụngkthigianphỏt)PHNCHUNGCHOTTCTHSINH(7im ... =0,25ViA=0chnB=1:(D)cúptly=0Ktlun:PTca(D)l3 4 0x y - = hayy=0.0,252 TỡmtagiaoimM(1im)(D)quaimA (100 )vcúvectchphng (1 1 2)u = - - urGiaoimM(00m)cho ( 10 )AM m = - uuuur0,25(a)cúvectphỏptuyn, ( 21)n AM u m m ộ ự = ... = 3 7 10 0x y - - =Nờn3d cúphngtrỡnh 7 3 0x y C + + = hay/3 7 0x y C - + =0,253d qua ( 78)P - nờnC=25C/=77Suyra:3: 7 3 25 0d x y + + = hay3:3 7 77 0d x y - + =0,25Theogithit D...