/images/1041385860215607387/1197771629250490458/dich-he-thong-tu-luyen-toan-nang-chuong-1081-thi-than-thuong-dung-hop.txt?ex=65bc7ac1&is=65aa05c1&hm=b2d74d9a1dc3f43eef582dc47e6a03c09225b8dc764e2892456f9368c8eb59e9&