... 2.(1,0) k : Ê x Ê t2 - t t = x - + - x (t 0) x - x - = 2 t -2 ta cú phng trỡnh: t - = -2 2t - t - = ột = , t ,nờn t = ờt = - x -1 + - x = 4x - x - = x2 - 4x + = x = t=2 III.(1,0) p Ta cú ... ỏn - thang im kim tra cht lng dy hc bi dng mụn toỏn D- nm 200 9-2 010 Cõu I(2,0) ỏp ỏn im 1.(1,25) Vi m = ta cú hm s : y = 2x - x-2 0,25 Tp xỏc nh : D =R\ {2} S bin thi n: -3 < , vi "x ẻ D ( x - ... = (0 ;-1 ;-3 ) , AC = ( -1 ;-1 ;3) n = AC , AB = (6 ;-3 ;1) [ ] ú mp(ABC) i qua im A(5 ;1;3) , v nhn n lm vtpt ,nờn cú pt: 6(x - 5) - 3(y - 1) + z - = pt(ABC): 6x - 3y + z - 30 = Gi H(x;y) Do H l...