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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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