/images/1041385860215607387/1259387081281503364/toan-cau-cu-tinh-tong-luyen-tap-sinh-khai-thuy-chuong-287-xuat-ngoai.txt?ex=668b7f1e&is=668a2d9e&hm=86446774fa8ce158eb95947fd53d06759bd583a568c297549b5b03aee50f9646&