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1. 75-5x=3x+3               Sol: x=9                2. 2x-1=3(2x-15)            Sol: x=11
3. 5+8x=2x+20                Sol: x=5/2             4. 2(x-2)=-(4-x)            Sol: x=0
5. 2y-3=y+5                  Sol: y=8               6. 2(3x-49)=-x+14           Sol: x=16
7. 2-6x=3x-1                 Sol: x=1/3             8. 20=2x-(10-4x)            Sol: x=5
9. 60x-1=3(1+12x)            Sol: x=1/6             10. 5(x-1)+10(x+2)=45       Sol: x=2
11. 2x+3(2x-1)=x+67 Sol: x=10                       12. 12x+3(2x-4)=60          Sol: x=4
13. 3-2x(5-2x)=4x2+x-30 Sol: x=3                    14. 3x-(x+1)=x-2            Sol: x=-1
15. 3[2x-(3x+1)]=x+1 Sol: x=-1                      16. x-3(x+5)=3x+10          Sol: x=-5
17. (x-15)=3(x-19)           Sol: x=21              18. 3(2-x)=18x-1            Sol: x=1/3
19. 3(x+4)=4x+1              Sol: x=11              20. 10+5(x-3)=3(x+1)        Sol: x=4
21. 2(3-4x)=2x-9             Sol: x=3/2             22. 10-9x=4(x-4)            Sol: x=2
23. 2(3x+2)=4[2x-5(x-2)] Sol: x=2                   24. 15x=2(1+9x)-3           Sol: x=1/3
57. 3(12-x)-4x=2(11-x)+9x Sol: x=1                  58. x+3=3(2x-4)             Sol: x=3
     3x                                                  x x -6
25.      + 2= x + 4                       26. x - 8 = -
     2                                                   2        3
           3x x                                  ⎛ x + 5 ⎞
27. x -        = +3                       28. 2 ⎜        ⎟ = x + 3
            4 7                                  ⎝ 3 ⎠
     9x           2x     1                    5x 3x
29.       - 6=        +                   30.       -     = x - 11
     4             3     3                     6       4
     3x           2x                                       5
31.       - 7=        +1                  32. x - 10 = (x - 6)
     5            6                                        9
     x                  2x                    3x                   x
33. + x = 10 +                            34.       + 1 = 12 -
     3                   9                     2                   3
     x      x                                             5x - 6
35. + = x - 3                             36. 4x - 7 =
     5      2                                                  4
     x+2                                      2x - 10 7
37.         = 5x - 4                      38.           =
       3                                      3x - 20 8
     x      3x                                x 13 5x 5
39. +            + x = 21                 40. -         =        -
     4       6                                4       6      2      6
     x      x      x                          x              x
41. + + = 94                              42. + 10 = + 16
     3      4      5                          3              5
     x -7       10                                           x
43.         =         - 3                 44. 3x - 9 + = 2x - 3
     x+3 x+3                                                 5
     3x
          _ 12
                                              x        2x           x
45. 5             =6                      46.    + 5=       - 2 -
        x +1                                  4         5          30
       3         x                            5x                 - 2x + 18
47.         =        -1                   48.     - 5 (x - 20) =
     x +1 x - 1                                8                       6
            x +1           x                        7-x           x-3
49. x +           =x +                    50. 3x -      = -1 +           + 2x
              5            2                         8              4
           3x       2x 5x                     x +1     3+ x           x
51. 8 -         +      -      =-9         52.       +        =1 +
           10       4      8                    2        6           3
10   3 + 4x
53.Error! Bookmark not defined.                54.       +        =3
                                                     x+5    x+5

55. x2-7x+12=0            Sol: x=3; x=4        56. x2-9x+18=0    Sol: x=3; x=6
57 x2-5x+6=0              Sol: x=2; x=3        58. x2+8x+15=0    Sol: x=-5x=-3
59. x2-6x-27=0            Sol: x=-3; x=9            2
                                               60. x -6x+9=0      Sol: x=3
61. x2+6x=-9              Sol: x=-3            62. 4x2+4x=3    Sol:x=1/2;x=-3/2
63. x2-9x+14=0            Sol: x=2; x=7        64. x2-6x+8=0      Sol: x=4; x=2
65. 2x2+10x-48=0          Sol: x=3; x=-8       66. x2-x=20       Sol: x=-4; x=5
67. x2=5x+6               Sol: x=6; x=-1       68. 2x2-5x+3=0    Sol:x=1; x=3/2
69. x2+10x+25=0           Sol: x=-5            70. x2+9=10x      Sol: x=1; x=9
71. 3x2-39x+108=0         Sol: x=4; x=9        72. 2x2-9x+9=0    Sol:x=3; x=3/2
73. 3x2+2x=8              Sol: x=-2; x=4/3     74. 4x2+12x+9=0   Sol: x=-3/2
75. 5x2+1=6x              Sol: x=1; x=1/5      76. 6x2+1=5x    Sol:x=1/2; x=1/3
77. 6x2-6=5x              Sol: x=-2/3; x=3/2   78. 2x2+7x+6=0 Sol: x=-2; x=-3/2
79 x2=2x+3                Sol: x=-1; x=3       80 4x2+3=8x     Sol:x=1/2; x=3/2
81 x2-x+1/4=0             Sol: x=1/2                 2
                                               82 3x -16x+5=0  Sol: x=5; x=1/3

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EJERCICIOS DE VERANO PARA SEGUNDO DE ESO

  • 1.   1. 75-5x=3x+3 Sol: x=9 2. 2x-1=3(2x-15) Sol: x=11 3. 5+8x=2x+20 Sol: x=5/2 4. 2(x-2)=-(4-x) Sol: x=0 5. 2y-3=y+5 Sol: y=8 6. 2(3x-49)=-x+14 Sol: x=16 7. 2-6x=3x-1 Sol: x=1/3 8. 20=2x-(10-4x) Sol: x=5 9. 60x-1=3(1+12x) Sol: x=1/6 10. 5(x-1)+10(x+2)=45 Sol: x=2 11. 2x+3(2x-1)=x+67 Sol: x=10 12. 12x+3(2x-4)=60 Sol: x=4 13. 3-2x(5-2x)=4x2+x-30 Sol: x=3 14. 3x-(x+1)=x-2 Sol: x=-1 15. 3[2x-(3x+1)]=x+1 Sol: x=-1 16. x-3(x+5)=3x+10 Sol: x=-5 17. (x-15)=3(x-19) Sol: x=21 18. 3(2-x)=18x-1 Sol: x=1/3 19. 3(x+4)=4x+1 Sol: x=11 20. 10+5(x-3)=3(x+1) Sol: x=4 21. 2(3-4x)=2x-9 Sol: x=3/2 22. 10-9x=4(x-4) Sol: x=2 23. 2(3x+2)=4[2x-5(x-2)] Sol: x=2 24. 15x=2(1+9x)-3 Sol: x=1/3 57. 3(12-x)-4x=2(11-x)+9x Sol: x=1 58. x+3=3(2x-4) Sol: x=3 3x x x -6 25. + 2= x + 4 26. x - 8 = - 2 2 3 3x x ⎛ x + 5 ⎞ 27. x - = +3 28. 2 ⎜ ⎟ = x + 3 4 7 ⎝ 3 ⎠ 9x 2x 1 5x 3x 29. - 6= + 30. - = x - 11 4 3 3 6 4 3x 2x 5 31. - 7= +1 32. x - 10 = (x - 6) 5 6 9 x 2x 3x x 33. + x = 10 + 34. + 1 = 12 - 3 9 2 3 x x 5x - 6 35. + = x - 3 36. 4x - 7 = 5 2 4 x+2 2x - 10 7 37. = 5x - 4 38. = 3 3x - 20 8 x 3x x 13 5x 5 39. + + x = 21 40. - = - 4 6 4 6 2 6 x x x x x 41. + + = 94 42. + 10 = + 16 3 4 5 3 5 x -7 10 x 43. = - 3 44. 3x - 9 + = 2x - 3 x+3 x+3 5 3x _ 12 x 2x x 45. 5 =6 46. + 5= - 2 - x +1 4 5 30 3 x 5x - 2x + 18 47. = -1 48. - 5 (x - 20) = x +1 x - 1 8 6 x +1 x 7-x x-3 49. x + =x + 50. 3x - = -1 + + 2x 5 2 8 4 3x 2x 5x x +1 3+ x x 51. 8 - + - =-9 52. + =1 + 10 4 8 2 6 3
  • 2. 10 3 + 4x 53.Error! Bookmark not defined. 54. + =3 x+5 x+5 55. x2-7x+12=0 Sol: x=3; x=4 56. x2-9x+18=0 Sol: x=3; x=6 57 x2-5x+6=0 Sol: x=2; x=3 58. x2+8x+15=0 Sol: x=-5x=-3 59. x2-6x-27=0 Sol: x=-3; x=9 2 60. x -6x+9=0 Sol: x=3 61. x2+6x=-9 Sol: x=-3 62. 4x2+4x=3 Sol:x=1/2;x=-3/2 63. x2-9x+14=0 Sol: x=2; x=7 64. x2-6x+8=0 Sol: x=4; x=2 65. 2x2+10x-48=0 Sol: x=3; x=-8 66. x2-x=20 Sol: x=-4; x=5 67. x2=5x+6 Sol: x=6; x=-1 68. 2x2-5x+3=0 Sol:x=1; x=3/2 69. x2+10x+25=0 Sol: x=-5 70. x2+9=10x Sol: x=1; x=9 71. 3x2-39x+108=0 Sol: x=4; x=9 72. 2x2-9x+9=0 Sol:x=3; x=3/2 73. 3x2+2x=8 Sol: x=-2; x=4/3 74. 4x2+12x+9=0 Sol: x=-3/2 75. 5x2+1=6x Sol: x=1; x=1/5 76. 6x2+1=5x Sol:x=1/2; x=1/3 77. 6x2-6=5x Sol: x=-2/3; x=3/2 78. 2x2+7x+6=0 Sol: x=-2; x=-3/2 79 x2=2x+3 Sol: x=-1; x=3 80 4x2+3=8x Sol:x=1/2; x=3/2 81 x2-x+1/4=0 Sol: x=1/2 2 82 3x -16x+5=0 Sol: x=5; x=1/3