Bai nay gjog 1 y nho trog 1 baj ma to toan truog chu van an soan.
Goj M(x;2x+1/x-1)
Vjet pttt taj M.
Tim giao diem cua tt vs 2 tiem can thj se tim dc A,B.
Sau do tinh IA,IB,AB.
Sd bdt cosj cho IA va IB.
AB se la 1bt chua can.trong can co the sd bdt cosj.
Chuc pan may man.
(Lam can than nhe)