Ch\u01b0\u01a1ng 6 – B\u00e0i 29: Luy\u1ec7n t\u1eadp: T\u00ednh ch\u1ea5t c\u1ee7a nh\u00f4m v\u00e0 h\u1ee3p ch\u1ea5t c\u1ee7a nh\u00f4m<\/a><\/blockquote><\/iframe>