Question

8-4,2:(2$frac{5}{14}$-1$frac{4}{21}$)

Answer 1

4,2:2=2,1
8-2,1=5,9

(2 5/14-1 4/21)=1 (15-8)/42=1 7/42=1 1/6
4,2:1 1/6=3,6
8-3,6=4,4

Answer 2

знак дроби

Answer 3

ясно