\u0110\u1ec1 thi v\u00e0 \u0110\u00e1p \u00e1n m\u00f4n To\u00e1n – k\u00ec thi kh\u1ea3o s\u00e1t ch\u1ea5t l\u01b0\u1ee3ng L\u1edbp 12 H\u00e0 N\u1ed9i<\/a><\/blockquote><\/iframe>