H\u00ecnh H\u1ecdc – Ch\u01b0\u01a1ng 2 – B\u00e0i 5: Phe\u0301p chi\u00ea\u0301u song song. Hi\u0300nh bi\u00ea\u0309u di\u00ea\u0303n cu\u0309a m\u00f4\u0323t hi\u0300nh kh\u00f4ng gian<\/a><\/blockquote><\/iframe>