/images/1041385860215607387/1197787671301455992/dich-he-thong-tu-luyen-toan-nang-chuong-611-lai-thay-he-thong-nhiem-vu-1.txt?ex=65bc89b2&is=65aa14b2&hm=609999ee79884c7a02e0f5ec8d1e10df4d19903bb74b1a17412180632a33030f&