ECUACIONES DE 1º GRADO.

ECUACIONES DE 1º GRADO

1. 2x-34=-20 Sol: x=7 2. 9x+8=7x+6 Sol: x=-1

3. 4x+3=3x+5 Sol: x=2 4. 7x+9=3+9x Sol: x=3

5. x-8=2x-11 Sol: x=3 6. x+1=2x-7 Sol: x=8

7. 6x+6=4+8x Sol: x=1 8. 9+9x=17+5x Sol: x=2

9. 2x+3=3x Sol: x=3 10. 25-2x=3x+20 Sol: x=1

11. 4x+1=3x+3 Sol: x=2 12. 5x-3=10x-6 Sol: x=3/5

13. 1+8x=-16x+31 Sol: x=5/4 14. 5x-11=15x-19 Sol: x=4/5

15. 12x-48=-15x-30 Sol: x=2/3 16. 2x+17=3x+7 Sol: x=10

17. 10-5x=x-2 Sol: x=2 18. 70-3x=4x Sol: x=10

19. 48-3x=5x Sol: x=6 20. -4x+30=-3x-10 Sol: x=40

21. 10x-15=4x+27 Sol: x=7 22. x-3(x-2)=6x-2 Sol: x=1

23. 3x+1=6x-8 Sol: x=3 24. 3x-7=2(x+1) Sol: x=9

25. 47-3x=5+11x Sol: x=3 26. 2(2+4x)=3+12x Sol: x=1/4

27. 30-9x=-7x+21 Sol: x=9/2 28. 5x=7(5x-3)+3 Sol: x=3/5

29. 3x-10=2x+1 Sol: x=11 30. 2(x-5)=3x-17 Sol: x=7

31. 25-2x=3x-35 Sol: x=12 32. 2+5(x-13)=x-3 Sol: x=15

33. 75-5x=3x+3 Sol: x=9 34. 2x-1=3(2x-15) Sol: x=11

35. 5+8x=2x+20 Sol: x=5/2 36. 2(x-2)=-(4-x) Sol: x=0

37. 2y-3=y+5 Sol: y=8 38. 2(3x-49)=-x+14 Sol: x=16

39. 2-6x=3x-1 Sol: x=1/3 40. 20=2x-(10-4x) Sol: x=5

41. 60x-1=3(1+12x) Sol: x=1/6 42. 5(x-1)+10(x+2)=45 Sol: x=2

43. 2x+3(2x-1)=x+67 Sol: x=10 44. 12x+3(2x-4)=60 Sol: x=4

45. 3-2x(5-2x)=4x2+x-30 Sol: x=3 46. 3x-(x+1)=x-2 Sol: x=-1

47. 3[2x-(3x+1)]=x+1 Sol: x=-1 48. x-3(x+5)=3x+10 Sol: x=-5

49. (x-15)=3(x-19) Sol: x=21 50. 3(2-x)=18x-1 Sol: x=1/3

51. 3(x+4)=4x+1 Sol: x=11 52. 10+5(x-3)=3(x+1) Sol: x=4

53. 2(3-4x)=2x-9 Sol: x=3/2 54. 10-9x=4(x-4) Sol: x=2

55. 2(3x+2)=4[2x-5(x-2)] Sol: x=2 56. 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

59. 60.

61. 62.

63. 64.

65. 66.

67. 68.

69. 70.

71. 72.

73. 74.

75. 76.

77. 78.

79. 80.

81. 82.

83. 84.

85. 86.

87. 88.

89. 90.

91. 92.

93. 94.

95. 96.

97. 98.

99.

100. 101.

102. 103.

104. 105.

106. 107.

108. 109.

Sol: 59. x=4; 60. x=12; 61. x=28; 62. x=1; 63. x=4; 64. x=12; 65. x=30; 66. x=15; 67. x=9; 68. x=6; 69. x= 10; 70. x=2; 71. x=1; 72. x=12; 73. x=12; 74. x=-16/27; 75. x=120; 76. x=45; 77. x= 2; 78. x=5; 79. x=5; 80. x=60; 81. x=2; 82. x=24; 83. x=2/3; 84. x=-1; 85. x=40; 86. x=0; 87. x=1; 88. x=2; 89. x=3; 90. x=0; 91. x=1; 92. x=0; 93. x=30; 94. x=2; 95. x=0; 96. x=-15/7; 97. x=0; 98. x=4; 99. x=b/a; 100. x=1/2; 101. x=5a/(1-a); 102. x=3; 103. x=-18/23; 104. x=27/7; 105. x=51/2; 106. x=2; 107. x=-2/7; 108. x=22/31; 109. x=-5

ECUACIONES DE 2º GRADO

110. x2-7x+12=0 Sol: x=3; x=4 111. x2-9x+18=0 Sol: x=3; x=6

112. x2-5x+6=0 Sol: x=2; x=3 113. x2+8x+15=0 Sol: x=-5; x=-3

114. x2-6x-27=0 Sol: x=-3; x=9 115. x2-6x+9=0 Sol: x=3

116. x2+6x=-9 Sol: x=-3 117. 4x2+4x=3 Sol:x=1/2;x=-3/2

118. x2-9x+14=0 Sol: x=2; x=7 119. x2-6x+8=0 Sol:

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