Ch\u01b0\u01a1ng 5 – B\u00e0i 27: B\u00e0i th\u1ef1c h\u00e0nh 4: \u0102n m\u00f2n kim lo\u1ea1i. Ch\u1ed1ng \u0103n m\u00f2n kim lo\u1ea1i<\/a><\/blockquote><\/iframe>