Thực hiện phép tính sau: (7 - 19/5) . 25/8 - 8/5 : 1/4

Bài 5:
a, ( 7- 19/5). 25/8- 8/5:1/4
b, 23/12- 5/12. (4/5- 1/10): -5/12
c,( 3/8+ (-1/4)+ 5/12): 2/3
d, -4/9. 2/9+4/7. 7/9 - 10/7+3
e, -36/35: 9/14. (-1/8)
g, 1/3: 5/4+ 1/3: 5/6+ 2/3