Ph\u1ea7n 1 – Ch\u01b0\u01a1ng 6 – B\u00e0i 10: C\u00e1ch m\u1ea1ng khoa h\u1ecdc – c\u00f4ng ngh\u1ec7 v\u00e0 xu th\u1ebf to\u00e0n c\u1ea7u h\u00f3a n\u1eeda sau th\u1ebf k\u1ec9 XX (ph\u1ea7n 1)<\/a><\/blockquote><\/iframe>