1. 2 4/5:1 1/2
2. 3 1/4*60=195
3. а)1/12+3/4=1/12+6/12=5/12 б)3 1/2+1/3=3 3/6+2/6=3 5/6
4. а)2/3-1/5=10/15-3/15=7/15 б)1 1/5-3/4=1 4/20-15/20=24/20-15/20=9/20
5. 3-(1 3/5+3/10)=3-(1 6/10+3/10)=3-1 9/10=1 1/10(л)
6.1/4+7/12+1 1/3-(1 1/6-1/2)=3/12+7/12+1 4/12-(1 1/6-3/6)=2 4/12-(7/6-3/6)=
=2 1/3-4/6=1 4/3-2/3=1 2/3
7. 3 3/5+(3 3/5+1 1/10)*2=3 3/5+47/10*2=3 6/10+9 4/10=13(м)