\u0110\u1ec1 thi h\u1ecdc k\u1ef3 1 m\u00f4n To\u00e1n l\u1edbp 12 S\u1edf GD&\u0110T \u0110\u00e0 N\u1eb5ng n\u0103m 2019<\/a><\/blockquote><\/iframe>