Tính 10/ 7 : - 8 /49

tính
10/7: -8/49
-25/30:-50/60
-3:-12/5
80/39:25/78
15/26: 30/39
25:-10/7
25/80: 75/40
-42/28:21/-48
16/48:32/54
-2/50:-10/15
-50/72:25/-12
-55/30:-77/90