3.1)1 2/5+4 3/4=5+( 2/5+3/4)=5+8/20+15/20=5+23/20=6 3/20
2)3 7/12+1 7/15=4 +(7/12+7/15)=4+35/60+28/60=4+63/60=5 3/60
3)6 3/20+5 3/60=11+(3/20+3/60)=11+9/60+3/60=11+12/60=11 12/60
Ответ:11 12/60 или 11 1/5
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3.1)1 2/5+4 3/4=5+( 2/5+3/4)=5+8/20+15/20=5+23/20=6 3/20
2)3 7/12+1 7/15=4 +(7/12+7/15)=4+35/60+28/60=4+63/60=5 3/60
3)6 3/20+5 3/60=11+(3/20+3/60)=11+9/60+3/60=11+12/60=11 12/60
Ответ:11 12/60 или 11 1/5