Tr\u01b0\u1eddng \u0110H B\u00e1ch Khoa H\u00e0 N\u1ed9i t\u1ed5 ch\u1ee9c k\u1ef3 thi ri\u00eang \u0111\u1ec3 x\u00e9t tuy\u1ec3n \u0111\u1ea1i h\u1ecdc<\/a><\/blockquote><\/iframe>