现出的：
1.ax+by+ay+bx
2.x^3+1
3.x^2+x^3
4.x^2+x^3-2
5.x^2-6x+8
6.x^2-12x+35
7.(x^3-1)+(x-1)(6x+11)
8.x^4-1
9.x^4+4
10.b^2+ab+ac+bc
11.x^3+y^3+z^3-3xyz
12.x^6+8x^3+9
13.x^2-100x+99
14.x^2-x-y^2-y
15.7x^2-19x-6
16.8x^2-6x-9
17.x+1)(x+2)-12
18.x^2+(p+q)x+pq
19.3x^3-6x^2+3
20.a^2(x－2a)^2－a(x－2a)^2
21.25m^2－10mn＋n^2
22.x^2-3x-28
23.y^4+2y^3-3y^2
24.(x－1)^2*(3x－2)＋(2－3x)
25.(x－2)^2－x＋2
26.x^2-12x-28
27.12a^2*b(x－y)－4ab(y－x)
28.a^2＋5a＋6
29.x^11-2x^10+x^9
30.x^2+x
31.x^3+x
32.x^4+x
33.100x^2+30xy+2y^2
34.6y^2-16y+8
35.6-7a-5a^2
36.3x^2-17x+10
37.6a^2-11ab+3b^2
38.2m^3+3m^2-5m
39.(x+y)^2-2(x+y)-3
40.a^2-b^2+2ab-c^2
41.m^2+2mn+n^2-1
42.x^2-4y^2+4yz-z^2
43.9x^2-4y^2-z^2+4yz
44.-25+a^2+9b^2-6ab
45.2x^2-100x-102
46.x^2*y^2-7xy+10
47.x^2-x-2
48.-x^2*y+6xy-8y
49.x^2-9y^2-x+3y
50.x^2-7x-8
出不动了.
难度不随题号变化,解题方法不随题号变化,老少皆宜,童叟无欺.
答案：
1.(a+b)(x+y)
2.(x+1)(x^2-x+1)
3.x^2*(x+1)
4.(x-1)(x^2-2x+2)
5.(x-2)(x-4)
6.(x-5)(x-7)
7.(x-1)(x+3)(x+4)
8.(x^2+1)(x-1)(x+1)
9.(x^2-2x+2)(x^2+2x+x)
10.(b+c)(b+a)
11.(x+y+z)(x^2+y^2+z^2-xy-yz-xz)
12.(x+1)(x^2-x+1)(x+2)(x^2-2x+4)
13.(x-99)(x-1)
14.(x+y)(x-y-1)
15.(7x+2)(x-3)
16.(2x-3)(4x+3)
17.(x+5)(x-2)
18.(x+p)(x+q)
19.(x-1)(x^2-x-1)
20.a(a-1)(x－2a)^2
21.(5m-n)^2
22.(x-7)(x+4)
23.y^2(y-1)(y+3)
24.x(x－2)(3x－2)
25.(x-2)(x-3)
26.(x-14)(x+2)
27.4ab(3a+1)(x-y)
28.(a+2)(a+3)
29.x^9*(x-1)^2
30.x(1+x)
31.x(1+x^2)
32.x(1+x)(1-x+x^2)
33.2(5x+y)(10x+y)
34.2(3y-2)(y-2)
35.(3-5a)(a+2)
36.(3x-2)(x-5)
37.(2a-3b)(3a-b)
38.m(m-1)(2m+5)
39.(x+y-3)(x+y+1)
40.(a+b-c)(a+b+c)
41.(m+n+1)(m+n-1)
42.(x+2y-z)(x-2y+z)
43.(3x+2y-z)(3x-2y+z)
44.(a-3b-5)(a-3b+5)
45.2(x-51)(x+1)
46.(xy-5)(xy-2)
47.(x-2)(x+1)
48.-y(x-2)(x-4)
49.(x-y)(x+3y-1)
50.(x-8)(x+1)