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因式分解:
23. x2-20x+100
24. x2+2x+1
25. x2-10x+25
26. 9x2+6x+1
27. 4x2-12x+9
46. x2-21x-100
47. 2x2+7x+3
48. 9x2+18x+8
49. 10x2+19x+6
50. 5x2+16x+12
5. 2x2-x
6. x(x+1)+x(x+2)
7. (x+2)(x-3)+(x+2)(x+4)
8. 2x+x2
9. (x+1)x-3x
10. (2x+1)(x+1)+(2x+1)(x-3)
11. x2-3x-bx+3b
28. 4x2+4x+1
29. 25x2-20x+4
30. 16x2-9
31. x2+14x+49
32. 9x2-30x+25
33. x2+8x+7
34. x2+3x+2
51. 6x2+23x+15
52. 4x2-4x+1
53. 6x2-11x+4
54. 12x2-29x+15
55. 39x2-38x+8
56. 5x2+7x-6
57. 3x2-4x-4
12. x2-ax+2x-2a
13. (x+2)2+2x(x+2)
35. x2+9x+18
36. x2+12x+20
58. 2x2+5x-3
59. 3x2-4x-7
14. 2x2+ax-6x-3a
15. x2-81
16. 4x2-9
17. x2-1
18. x2-49
37. x2-7x+6
38. x2-16x+15
39. x2-8x+12
40. x2+3x-10
41. x2+19x-20
60. 36x2+39x+9
61. x2+11x+24
62. x2-3x-40
63. 15x2+x-2
64. 21x2-31x-22
19. 36-25x2
20. 8-2x2
21. 3x2-27
22. x2+8x+16
42. x2+4x-12
43. x2-13x-30
44. x2-x-2
45. x2-4x-60
65. 12x2-50x+8
1.
2.
3.
4.
3x2+x
2ax2+6ax
ax2-x
3bx2-6bx
解下列方程式:
1.
2.
3.
4.
2
2x -5x=0
x2-9=0
9x2=4x
x2-4=0
2
23. 2x2-5x+2=0
24. (5x+2)(x-2)=17
25. (3x+1)2=4
26. (x-1)2=2(x2-1)
27. 2(x-1)(x-3)=5x
2
5. 2x +7x+6=0
6. 5x2-8x=21
7. x2-3x-4=0
8. 2x2-3=5
9. 4x2+4x-15=0
10. 6x2-7x-3=0
11. 12x2-23x=24
28. 3x -7x+1=2x+13
12. 4x2+4x+1=0
13. 2x2+18=12x
3.
3
2

5
7
7  11
4.
5
5.
2
7

3
5
2
14. x -4x+4=0
15. 3x2+18x+27=0
16. 3x2-4x-1=-9x-3
17. x2-4x+4=4x+4
18. 7x2+6=2x+11
19. (2x+3)(x+1)=1
20. (x+5)(x+3)=8
21. x2+6x+9=0
22. 4x2+6x=0
求下列各式之值:
1.
2.
6.
7.
3
15
2
2
3
48
3
6
2
3
8.
9.
14
7

5
30
12
3
1
2
10.
18 
11.
2
7

3
5
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