1) 1 30/37 + 2,5 + 3 7/37 = (1 + 2 + 3) + (30/37 + 7/37) = 6 + 37/37 = 6 + 1 = 7
2) (1 7/25 + 8/9) - 7/25 = (1 + 8/9) + 7/25 = (9/9 + 8/9) - 7/25 = 17/9 - 7/25 = (425/225) - (63/225) = 362/225
3) 15/29 + (14/299 - 2/3) = 15/29 + (14/299 - 198/297) = 15/29 + (14/299 - 198/299) = 15/29 - 184/299 = (15299 - 18429)/(29*299) = (4485 - 5336)/(8671) = -851/8671
4) (8 4/15 + 11/20) - 4/15 = (8 + 11/20) - 4/15 = (160/20 + 11/20) - 4/15 = 171/20 - 4/15 = (171*3 - 80)/60 = (513 - 80)/60 = 433/60
1) 1 30/37 + 2,5 + 3 7/37 = (1 + 2 + 3) + (30/37 + 7/37) = 6 + 37/37 = 6 + 1 = 7
2) (1 7/25 + 8/9) - 7/25 = (1 + 8/9) + 7/25 = (9/9 + 8/9) - 7/25 = 17/9 - 7/25 = (425/225) - (63/225) = 362/225
3) 15/29 + (14/299 - 2/3) = 15/29 + (14/299 - 198/297) = 15/29 + (14/299 - 198/299) = 15/29 - 184/299 = (15299 - 18429)/(29*299) = (4485 - 5336)/(8671) = -851/8671
4) (8 4/15 + 11/20) - 4/15 = (8 + 11/20) - 4/15 = (160/20 + 11/20) - 4/15 = 171/20 - 4/15 = (171*3 - 80)/60 = (513 - 80)/60 = 433/60