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1、学 海 无 涯,解方程,5,8,1,12,2,3,1,6,1. x =2. x =3. 4x7.513,4. x0.6 x5 5.,5,6,x3.3 6.,5,4,x =10,7. x,24,13,4,1,3,1,6,1,37,415,=8.=19. 81 x =7,55,14,8,3,10. 20%=11. x -x =20 12.,243 5 x = 9 8,11 13.x - 4 x = 24 14. 4 x + 2 x = 9,52 15.9 + 2 x = 3,16.,5 8,55,1,34,321 x -=17.x +x =364,1,98,1,18. （1）x = 9,学 海 无
2、 涯,3,54,19.x =20 3,2,35,20.x 2 x =12,21. 7 x 5 = 2 123,22. x 1 x = 1 49,23. 4 x7.513,24.9.8-2 x =3.8,632,111 25. a+ = 26. x3x =24,27.,1 3,1,2,xx5,36,11 28. 8.65+ -a + =0,29.x - 1,5,x =20,9,30. 4 x =36,4,5,18,25,1,3,31.x =32. x x12,17,816,33. 3 x ,2,学 海 无 涯,1,2,= 0.6,37. 15 x +6 x = 168 38. x -,=39.
3、2 x +5 = 40,40. 3.5 x = 14041.20% x30,105,7,42. 5 x3 7 =,2,3,1,3,4,3,1,2,43. 5 x = 44. 2 x - x =45. 1.5 x =2.25,510,817,46. x = 47. x = 48.,x30% x,（）,x,51. 37.520% x69.5,49. 8（x）= 50.,158,34. 4x = 16 35. x - 5x =15 36. x 5,11 42,8,11,33,16,8,5,20,7,44,35,4,3,2,学 海 无 涯,55.,56. 20% x,58. 12 x =,x =15
4、62. x20% = 20,64.4（4 x1）=3（22x）65. 1.5 x =28.5 66. （0.5+ x）+ x=9.82,15,52. x - 7,25,x = 1453. 4.2 33x = 5.1 54.13.7x = 5.29,1 9,3,x = 2,14 55,3,6,=57. 1x 1x = 1 1 4,8,61. x 5,63. x 6,7144,4, 9 = 3,学 海 无 涯,67.,x2=40 68. 7（2 x -6）=84,69. 8 x =42,74.,75. 1.5 x +6=3 x,5,3 78. x + 2.58=95 79. 53-x2=8,20,
5、17,4,3,80.x =,82. x 1 4 = 1 472,83. 1 x 5 = 5 2832,81. x 5 5 =150 86,3 5,6,70. x= 71. 7144,93,1 3,x 5 = 3,1,72. 3 x = 6 57,5420,73. 3x11411,77,x 2 x 6,8,5,532 76.x -= 5,77. (,5,8 15 1236,)xx,5252 35,学 海 无 涯,84. 6x 2 = 3 714,85. x - 8 1 = 3 48,86. x 10 = 5 2114,48,87. 5x 3 = 7,125,88. x 7 = 2,15,89. 1 3 x = 1 5 ,90. 3 x 5 1 =1 1 422,91. 1 x 11 6 1 222,92.,x 15% 25.5,93. x 1 x 20 4,94. 6 4 1 x 12 2,95.,x 10%x 3.3,96. x 24% 1 43 50,97. 2 x 75%x 1 56,6,98. 18 150%x 7.5,99. x 60% x =18,100.40% x +30=80,
