Решите (7/15+3/10)*2 14/23+1 6/57 7/19-30/57

(7/15+3/10)*2 14/23+1 6/57: 7/19-30/57 = 28  9/19

7/15+3/10 = 14/30+9/30=23/30
23/30*2 14/23 = 23/30*60/23=2

1 6/57: 7/19 = 63/57:7/19 = 63/57*19/7=27

2+27-30/57=29 - 30/57 = 28 27/57 = 28 9/19