... x - + - x ) - x - ( -2 x -5 ) - x - - x - -2 x -5 - x - + -2 x - 1-x x + x - 21 x ẻ ( - - ] ẩ [ +Ơ ) 2 Kthpiukin x Ê - tactpnghiml T2 = ( - - ] Vytpnghimcabtphngtrỡnhóchol T = ( - - ... - 1) x + - ( x -1 ) x + + x - x +5 ) x + x - 21 x ẻ ( - - ] ẩ [ +Ơ 2 x + x + - x -1 0.25 0.25 1.0 0.25 Kthpiukin x tactpnghiml T1 = [ +Ơ) 0.25 TH2:Xột x Ê - Binibpttngngvi - x -3 ( -2 ... ngtrũniquabaimA,B,Cl: x2 + y2 - 4x- 8y+ 10= 2. x y z + + = a b c IA= (4 - a56 JA= (45 - b6) JK = (0-b c) IK = (- a0 c) ) ỡ ù a +b + c = ù VỡAltrctõmtamgiỏcIJKnờn - + = b c - + = a c ù ợ 77 77...