1)7/12-8/15=35/60-32/60=3/60=(1/20)^2=1/400
2)7/10-9/16=56/80-45/80=11/80
3)4/5*11/80=11/100
4)1/400+11/100=1/400+44/400=45/400=9/80
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1)7/12-8/15=35/60-32/60=3/60=(1/20)^2=1/400
2)7/10-9/16=56/80-45/80=11/80
3)4/5*11/80=11/100
4)1/400+11/100=1/400+44/400=45/400=9/80