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 :(2 514-1 421)=4,4

1)2 514-1 421=3314-2521=99-5042=4942

2)4,2 :4942=4210 *4249=1764490=3,6

3)8-3,6=4,4