2) 8 5/12+5/6-5 3/4-2 1/2=
8 5/12+10/12-5 9/12-2 6/12=1
3)(7 4/9-2 3/10)+(1 7/9+4 2/9-5 1/2)=
(7 40/90-2 27/90)+(6-5 1/2)=5 13/90+
1/2=5 13/90+45/90=5 29/45
4)5 1/2-(1 3/14+11/21)+(4 5/12-2)=
6 5/24
1) 1 3/14+11/21=1 9/42+22/42=1 31/42
2)5 1/2-1 31/42=4 63/42-1 31/42=
3 16/21
3)4 5/12-2=2 5/12
4)3 16/21+2 5/12=3 64/84+2 35/84=
6 5/24