Question

50 БАЛЛОВ!
Помагите пример пожалуйста!

Answer 1

(1 16/21-3 4/9):(-1 11/42)+1 5/7:(-4)=19/21

1) 1 16/21-3 4/9=1 48/63-3 28/63=1 48/63-2 91/63=-1 43/63
2) -1 43/63:(-1 11/42)=-106/63:(-53/42)=4/3=1 1/3
3) 1 5/7:(-4)=12/7:(-4)=-3/7
4) 1 1/3+(-3/7)=1 7/21-9/21=28/21-9/21=19/21

Answer 2

19/21 - точно

Answer 3

1) 1 16/31-3 4/9=-(31/9-37/21)=-106/21*3
2) -106/(21*3)*(-42/53)=4/3
3) -12/7*1/4=-3/7
4) 4/3-3/7=(28-9)/21=19/21 - ответ.