1) 79/80 - (3/16 + 39/80) = 79/80 - (3/16 + 39/80) = 79/80 - (49/80) = (79-49)/80 = 30/80 = 3/8
2) 2/45 + (41/45 - 7/9) = 2/45 + (41/45 - 35/45) = 2/45 + 6/45 = 8/45
3) 7/15 - (2/15 + 1/5) = 7/15 - (2/15 + 3/15) = 7/15 - 5/15 = 2/15
4) 3/16 + (15/16 - 5/8) = 3/16 + (15/16 - 10/16) = 3/16 + 5/16 = 8/16 = 1/2
1) 79/80 - (3/16 + 39/80) = 79/80 - (3/16 + 39/80) = 79/80 - (49/80) = (79-49)/80 = 30/80 = 3/8
2) 2/45 + (41/45 - 7/9) = 2/45 + (41/45 - 35/45) = 2/45 + 6/45 = 8/45
3) 7/15 - (2/15 + 1/5) = 7/15 - (2/15 + 3/15) = 7/15 - 5/15 = 2/15
4) 3/16 + (15/16 - 5/8) = 3/16 + (15/16 - 10/16) = 3/16 + 5/16 = 8/16 = 1/2