1/5*45=1*45/5=9 1/6*48=1*48/6=6 , 9: 1/2=9*2/1=18, 3:1/4=3*4=12 10:1/2=20
5:1/3=15
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1/5*45=1*45/5=9 1/6*48=1*48/6=6 , 9: 1/2=9*2/1=18, 3:1/4=3*4=12 10:1/2=20
5:1/3=15