Jawabanmu

2014-02-11T00:16:25+07:00
  : 25- 21  :  
7     5        35         35


2014-02-11T00:29:48+07:00
1. 5/7 - 3/5 = 25/35 - 21/35 = 4/35
2. 11/12 - 2/7 = 33/48 - 12/48 = 21/48
3. 9/10 - 1/4 = 36/40 - 10/40 = 26/40
4. 5/9 - 7/12 = 40/72 - 42/72 = -2/72 = -1/36

Kalau salah mohon maaf yah