有理数加减法计算是数学中的基础知识，对于初中学生来说，掌握这些知识是非常重要的。下面为大家提供50道有理数加减法计算题及答案。

1. (2/3) + (-1/2) = 1/6

2. (-7/8) - (-1/4) = -5/8

3. (-5/6) + (4/9) = -1/18

4. (-3/5) - (2/3) = -19/15

5. (-1/4) - (1/2) = -3/4

6. (2/3) - (1/6) = 5/6

7. (-5/6) + (-2/9) = -11/18

8. (1/2) + (-3/4) = -1/4

9. (-2/3) - (-1/2) = -1/6

10. (3/4) + (1/6) = 5/8

11. (-7/8) + (-5/12) = -11/24

12. (2/3) - (-5/6) = 1/2

13. (-1/3) - (-2/5) = 1/15

14. (3/4) + (-1/3) = 5/12

15. (-5/6) - (-1/3) = -1/2

16. (7/8) + (1/4) = 15/16

17. (-2/5) - (3/8) = -19/40

18. (1/2) + (-2/3) = -1/6

19. (-3/4) - (-1/6) = -5/8

20. (5/6) + (-2/3) = 1/6

21. (-3/5) + (-1/2) = -11/10

22. (1/3) - (1/4) = 1/12

23. (4/5) - (1/2) = 3/10

24. (-1/6) - (-1/3) = 1/6

25. (-2/3) + (-1/4) = -11/12

26. (1/2) - (-3/4) = 5/4

27. (-5/6) - (-2/3) = -1/6

28. (2/3) + (5/6) = 7/6

29. (-1/3) + (2/5) = 1/15

30. (3/4) - (-1/3) = 17/12

31. (-5/6) + (1/3) = -1/2

32. (7/8) - (1/4) = 5/8

33. (-2/5) + (3/8) = 1/40

34. (1/2) - (-2/3) = 7/6

35. (-3/4) + (-1/6) = -5/8

36. (5/6) - (-2/3) = 7/6

37. (-3/5) - (-1/2) = -1/10

38. (1/3) + (1/4) = 7/12

39. (4/5) + (1/2) = 13/10

40. (-1/6) + (-1/3) = -1/2

41. (-2/3) - (-1/4) = -5/12

42. (1/2) + (-3/4) = -1/4

43. (-5/6) + (-2/3) = -19/18

44. (2/3) + (5/6) = 7/6

45. (-1/3) + (2/5) = 1/15

46. (3/4) - (-1/3) = 17/12

47. (-5/6) + (1/3) = -1/2

48. (7/8) - (1/4) = 5/8

49. (-2/5) + (3/8) = 1/40

50. (1/2) - (-2/3) = 7/6

以上是50道有理数加减法计算题及答案，希望能够帮助初中学生们更好地掌握这些知识。