Ph\u1ea7n M\u1ed9t – Ch\u01b0\u01a1ng VI – B\u00e0i 10: C\u00e1ch m\u1ea1ng khoa h\u1ecdc-c\u00f4ng ngh\u1ec7 v\u00e0 xu h\u01b0\u1edbng to\u00e0n c\u1ea7u h\u00f3a n\u1eeda sau th\u1ebf k\u1ec9 XX<\/a><\/blockquote><\/iframe>