因式分解--十字相乘法练习题含答案

十字相乘法因式分解练习题

1、x2?3x?2?

3、x2?4x?21?

5、x4?6x2?8?

7、x2?3xy?2y2?

9、x2?4x?3?

11、y2?7y?12?

13、x2?x?20?

15、p2?5p?36?

17、x4?x2?20?

19、a2?9ab?14b2?

21、x2y2?5x2y?6x2?

23、3x2?11x?10?

25、6x2?7x?5?

27、2x2?15x?7?

29、5x2?7x?6?

31、3a2b2?17abxy?10x2y2?

2、x2?7x?6?

4、x2?2x?15?

6、(a?b)2?4(a?b)?3?

8、x4?3x3?28x2?

10、a2?7a?10?

12、q2?6q?8?

14、m2?7m?18?

16、t2?2t?8?

18、a2x2?7ax?8?

20、x2?11xy?18y2?

22、?a3?4a2?12a?

24、2x2?7x?3?

26、5x2?6xy?8y2?

28、3a2?8a?4?

30、5a2b2?23ab?10?

32、4x4y2?5x2y2?9y2?1

33、4n2?4n?15?

34、6l2?l?35?

35、10x?21xy?2y?

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36、8m?22mn?15n?

2237、(x?5x?3)(x?5x?2)?6? 38、(x?1)(x?2)(x?3)(x?4)?24?

(1) a2-7a+6; (2)8x2+6x-35; 22

(3)18x2-21x+5;

(5)2x2+3x+1;

(7)6x2-13x+6;

(9)6x2-11x+3;

(11)10x2-21x+2;

(13)4n2+4n-15;

(15)5x2-8x-13;

(17)15x2+x-2;

(19) 2(a+b) 2+(a+b)(a-b)-6(a-b) 2;

(4) 20-9y-20y2; (6)2y2+y-6; (8)3a2-7a-6; (10)4m2+8m+3; (12)8m2-22m+15; (14)6a2+a-35; (16)4x2+15x+9; (18)6y2+19y+10; (20)7(x-1) 2+4(x-1)-20;

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