【求完整解答及說明】中二代數分式四條

1:

2c - d/c^2d + c + d/cd^2

2:

4r + 5s/7r + 2r - 3s/5r

3:

6/b - 12b - 3/2b^2

4:

4m - 5/8m^2 + 4/-12m

求完整解答及說明，謝謝！