... "lo*.0,50LTas€tinh.l =f*clx, ddt x:tanr =r dt:-+ dr:(l .of,)d,, x= r/3 thi IV(1 ili1nt)o (0,50 ilid@. Dung thirit diQn cira mat phing di qua A, M va song song v6.i BD.Gqi ... sinh tu sidi.i. (t,o aiiiml . Tim c6c gi|tri mEuong thang y = m(x-2) + 2 cttd0 thi (C) tai hai di'5m phdn bi6t <+c6 hai nghiQm phdn bi€t <+ pt nrx' ... vdi mgi m > 0. Eing thri'c xdy rakhi vd chi khi m : L Vdy, v6'i rh: I thi AB ngdn nhat Uing V40 .0,25II(2 cti6m)l. ( 1,0 clilnt\ . Gi6i phLro-ng trinh .Ei6u...