第二章:有理數

一、有理數的意義

1. 正數和負數(一)                                                                                                         2. 正數和負數(一)

3. 數軸(一)                                                                                                               4. 數軸(二)

5. 相反數                                                                                                                       6. 絕對值(一)

7. 絕對值(二)                                                                                                           8. 單元練習三

9. 單元練習四

                          二有理數的運算

10. 有理數的加法(一)                                                                                            11. 有理數的加法(二)

12. 有理數的減法                                                                                                        13.有理數加減法混合運算

14.有理數加減法混合運算(二)                                                                             15. 有理數的乘法(一)

16. 有理數的乘法(二)                                                                                                  17. 有理數的除法

18. 有理數的乘方                                                                                                         19. 有理數的混合運算(一)

20. 有理數的混合運算                                                                                                  21. 近似數與有效數字練習二十七

22. 有理數的運算                                                                                                          23. 綜合練習(一

24. 綜合練習(二)