N
nbaotin


cho duong tron (C) x^2+y^2-4x-4y +4=0
va duong thang d x+y-2=0 cat duong tron C tai 2 diem phan biet A,B. tim diem M thuoc C sao cho chu vi tam giac MAB lon nhat
va duong thang d x+y-2=0 cat duong tron C tai 2 diem phan biet A,B. tim diem M thuoc C sao cho chu vi tam giac MAB lon nhat