... khongd6i)'.? 4-4 4.bit'I qt'i9r-v'l-ole eeg gll +-{ lt-" 1-( 1)&apos ;- - - - lx=2+2tI+) Chqn G =6 =(Z;-t;2) + phuong trinh tU:ll =-3 -t. Thay vio phucrng ... (1)e 2(xr-1; 3xr-6) -3 (*r-l; 3- xr)O{* =}lx, -z(suy ra ^lit ;), BQ;z) .Suy ra phucrns nlnh d : x - y- 0 .*) (2)<+ 2(x, - 1; 3*r- 6) = -3 (x , -li3 - xr)* fi; ... [x-4=ffi.og: 1 6- 16 - o + aoB: 9oo.+)NCu d LOx* pt d:y-k{x-4 )- * M(4;la$;=+{LB(A;0),4) -4 )Tqa 6Q A, B la nghiQm cria h$li;la;G;'a;aist{uii,;iaiffi-pifi;i,i-ditii-(it;ltt;si;Gil;i'd;tilct...