Question

ПОМОГИТЕ!!!
5/7 + 1/28 +3/4 =
5/12 + 7 + 6 3/4 =
4 + 3/5 -3 1/4 =

Answer 1

1)5/7 + 1/28 +3/4 =(20+1+21)/28=42/28=5*(1/4)=5,25

Answer 2

2)5/12 + 7 + 6 3/4 =5/12+84/12+81/4=170/12=14*(1/6)

Answer 3

а 3 ?

Answer 4

3)4 + 3/5 -3 1/4 =23/5-13/4=(92+65)/20=157/20=7*(17/20)=7.85