5 l\u1eddi khuy\u00ean khoa h\u1ecdc \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c t\u1eadm l\u00fd t\u1ed1t nh\u1ea5t khi l\u00e0m b\u00e0i thi.<\/a><\/blockquote><\/iframe>