[Gi\u1ea3i To\u00e1n 10] Ch\u01b0\u01a1ng 1: Vect\u01a1\/ B\u00e0i 2: T\u1ed5ng v\u00e0 hi\u1ec7u c\u1ee7a hai vect\u01a1<\/a><\/blockquote><\/iframe>