【作业 1】把下列各式因式分解 (1) 2 33aabba (2) 22 691xxyy (3) 22 amanmn (4) 222 2ababc 【答案】 (1)()(3)ab a; (2)(31)(31)xyxy (3)()()mn amn (4)()()cab cab 【作业 2】因式分解: (1)6432abab 32 (2)1aaa 22 (3)33xxyy 22 (4)xbxaab 【答案】(1) (32)(21)ba ; (2) 2 (1)(1)aa; (3) ()(331)xyxy ; (4) ()()xa xab; 【作业 3】因式分解: 分组分解法 22 (1)amanmn 22 (2)926abab 22 (3)21xyy 22 (4)94129xxyy 【答案】(1) ()()mn amn; (2) (3 )(32)ab ab; (3)(1)(1)xyxy; (4)(323 )(323 )xyxy 【作业 4】因式分解 32 (1)2288aa bba 2 (2)2436xxyxy (3) 22 35294xxyyxy (4)axaybxcycxby 【答案】 2 (1)()(28)aba (2)(2 )(23)xyx 3 (3x-y+4)(x+2y-1)( ) (4)( )()xy abc