а)3 3/4+1/5=15/4+1/5=75/20+4/20=79/20=3 19/20
б)7 9/20+7/30=149/20+7/30=4470/600+140/600=4610/600=461/60=7 41/60
в)4 13/25+2/15=113/25+2/15=1695/375+50/375=1745/375=349/75=4 49/75
г)6 1/12+1/18=73/12+1/18=1314/216+12/216=1326/216=221/36=6 5/36
д)5 3/10+11/15=53/10+11/15=795/150+110/150=905/150=181/30=6 1/30
е)9 5/24+35/36=221/24+35/36=7956/864+840/864=8796/864=733/72=10 13/72
