Решите пример ! решите пример ! 8 + 4 1/5 / (2 5/14 - 1 4/21 )

2 5/14-1 4/21=33/14-25/21=99/42-50/42=49/42=7/6
8-4,2:(2 5/14-1 4/21)=4,4
4,2:7/6=4 2/10:7/6=42/10:7/6=42/10*6/7=36/10=3,6

8-3,6=4,4

1) 2 5/14 - 1 4/21 = 2 105/294 - 1 56/294 = 1 49/294 = `1 7/42 = 1 1/6 
2) 8 + 4 1/5 = 12 1/5 
3) 12 1/5 : 1 1/6  = 61/5 : 7/6 = 366/35 = 10  16/35