B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m H\u00ecnh h\u1ecdc 12 \u2013 Ch\u01b0\u01a1ng 1 – \u0110\u1ec1 ki\u1ec3m tra ch\u01b0\u01a1ng 1 (ph\u1ea7n 3)<\/a><\/blockquote><\/iframe>