Ответ:
9/20-7/12= 3(9/20)-5(7/12)=27/60-35/60=27-35/60= -8/60 = -2/15
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Ответ:
9/20-7/12= 3(9/20)-5(7/12)=27/60-35/60=27-35/60= -8/60 = -2/15