/images/1041385860215607387/1259678096299393034/trung-sinh-chi-giao-vien-dac-chung-binh-chuong-1052-an-toan-de-nhat.txt?ex=668c8e25&is=668b3ca5&hm=0a92f6c9e6f6a4e37f47b643fc333c065477bb2b328f08efbcc7e0a1cfdb9a44&