现出的：1. ax+by+ay+bx2. x^3+13. x^2+x^34. x^2+x^3-25. x^2-6x+86. x^2-12x+357. (x^3-1)+(x-1)(6x+11)8. x^4-19. x^4+410. b^2+ab+ac+bc11. x^3+y^3+z^3-3xyz12. x^6+8x^3+913. x^2-100x+9914. x^2-x-y^2-y15. 7x^2-19x-616. 8x^2-6x-917. x+1)(x+2)-1218. x^2+(p+q)x+pq19. 3x^3-6x^2+320. a^2(x－2a)^2－a(x－2a)^221. 25m^2－10mn＋n^222. x^2-3x-2823. y^4+2y^3-3y^224. (x－1)^2*(3x－2)＋(2－3x)25. (x－2)^2－x＋226. x^2-12x-2827. 12a^2*b(x－y)－4ab(y－x)28. a^2＋5a＋629. x^11-2x^10+x^930. x^2+x31. x^3+x32. x^4+x33. 100x^2+30xy+2y^234. 6y^2-16y+835. 6-7a-5a^236. 3x^2-17x+1037. 6a^2-11ab+3b^238. 2m^3+3m^2-5m39. (x+y)^2-2(x+y)-340. a^2-b^2+2ab-c^241. m^2+2mn+n^2-142. x^2-4y^2+4yz-z^243. 9x^2-4y^2-z^2+4yz44. -25+a^2+9b^2-6ab45. 2x^2-100x-10246. x^2*y^2-7xy+1047. x^2-x-248. -x^2*y+6xy-8y49. x^2-9y^2-x+3y50. 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)^221. (5m-n)^222. (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)^230. 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)。