Bi\u1ec3u \u0111\u1ed3 ch\u1ec9 ra s\u1ef1 b\u1ea5t th\u01b0\u1eddng “kh\u1ee7ng khi\u1ebfp” \u0111i\u1ec3m thi m\u00f4n To\u00e1n c\u1ee7a H\u00e0 Giang<\/a><\/blockquote><\/iframe>