Bài 3:
a: 11/120=11/120
7/40=21/120
c: 24/146=312/1898
6/13=876/1898
c: 7/30=28/120
-9/40=-27/120
13/60=26/120
d: 17/60=51/180
-5/18=-50/180
-64/90=-128/180
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