... I,fitnVTJ?d1= = t2 0,50 Tas€tinh.l =f*clx, , o (0,50 ddt x:tanr =r dt:-+ dr:(l of,)d, x= r/3 thi ilid@ Dung thirit diQn cira mat phing di qua A, M va song song v6.i BD Gqi o=AC o BD, o' =A'c' n B'D' ... [; = i:i' B(l+t;2 +t) thing x +y vd A(- 5; 5) : x- y+ l-s-s+r-jI Goi AH ld dudng cao, ta c6 AH - :-: - I - ,/Z - : 0, n€n B rhu6cdr-rongcaoxu6t +t)-z-r+ I -0 +t:- Duo'ng thing BC vitit va d4ng ... CAU L (1.0 man Hoc sinh tu sidi i (t,o aiiiml Tim c6c gi|tri m Euong thang y = m(x-2) + cttd0 thi (C) tai hai di'5m phdn bi6t ...