1). 1/8+2/15+7/30
=15/120+16/120+28/120
=31/120+28/120
=59/120
2). 5/6+3/4-1/3
=10/12+9/12-4/12
=19/12-4/12
=15/12
=5/4
3). 11/12-(1/6+1/8)
=11/12-(4/24+3/24)
=11/12-7/24
=22/24-7/24
=15/24
=5/8
1/8+2/15+7/30
=15/120+16/120+28/120
=59/120
5/6+3/4-1/3
=10/12+9/12-4/12
=5/4
11/12-(1/6+1/8)
=22/24-4/24-3/24
=5/8
1/8+2/15+7/30
=15/120+16/120+28/120
=(15+16+28)/120
=59/120
5/6+3/4-1/3
=10/12+9/12-4/12
=(10+9-4)/12
=15/12
=5/4
11/12-(1/6+1/8)
=11/12-(4/24+3/24)
=11/12-7/24
=22/24-7/24
=15/24
=5/8