8-4.2:(2.5/14-1.4/21)=

Question

8-4.2:(2.5/14-1.4/21)=

Answer 1

8-4,2:(2 5/14-1 4/21)=4,4

2 5/14-1 4/21=33/14-25/21=99/42-50/42=49/42=7/6

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

Answer 2

8-4,2 :(2 5\14-1 4\21)=4,4

1)2 5\14-1 4\21=33\14-25\21=99-50\42=49\42

2)4,2 :49\42=42\10 *42\49=1764\490=3,6

3)8-3,6=4,4