... thớch gỡ thờm 25 thi th tt nghip mụn toỏn cú li gii chi tit Cõu P N THI TH THPT QUC GIA NM 2015 ỏp ỏn a) (1,0 im) (2,0) Tp xỏc nh D Ă \ S bin thi n: im 0 ,25 - Chiu bin thi n: y ' 0, ... (t 2)2 X (1d) 0 ,25 t f(t) 0 ,25 2 - + + + + 0 ,25 f(t) x y f (t ) = f(4) = t c Do ú P = (2; ) xy x y 0 ,25 25 thi th tt nghip mụn toỏn cú li gii chi tit s 06 Mụn: TON Thi gian lm bi: ... cc tiu ti x = 0, yCT = Bng bin thi n th: im c bit: (0; 1), (-1; 3), (1; 3) 0 .25 0 .25 25 thi th tt nghip mụn toỏn cú li gii chi tit b x 3x m x4 3x2 m 0 .25 S nghim ca phng trỡnh l s giao...