1)(3 1/3+2,5)*3/7=(10/3+5/2)*3/7=(35/6)*3/7=5/2=2,5
2)3,5*(2 1/7-1 1/5)=3,5*(33/35)=7/2*33/35=33/10=3,3
3)7/9*1 3/7-1,7=7/9*10/7-17/10=10/9-17/10= -53/90
4)6/35:(4,8-3 3/7)=6/35:(24/5-24/7)=6/35:48/35=6/35*35/48=1/8
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1)(3 1/3+2,5)*3/7=(10/3+5/2)*3/7=(35/6)*3/7=5/2=2,5
2)3,5*(2 1/7-1 1/5)=3,5*(33/35)=7/2*33/35=33/10=3,3
3)7/9*1 3/7-1,7=7/9*10/7-17/10=10/9-17/10= -53/90
4)6/35:(4,8-3 3/7)=6/35:(24/5-24/7)=6/35:48/35=6/35*35/48=1/8