Ответ:

1) \(3{,}12:0{,}6=5{,}2\), \(24:0{,}75=32\), \(3:25=0{,}12\), \(28:0{,}35=80\).

\(5{,}2+32-0{,}12+80=117{,}08\).

2) \(56{,}42:1{,}4=40{,}3\), \(1{,}5536:0{,}82=1{,}894634146\ldots\).

\((40{,}3-1{,}894634146\ldots)\cdot2{,}1-6{,}8=73{,}851268292\ldots\).

3) \(7{,}0056:0{,}072=97{,}3\).

\(120-(97{,}3+14{,}62)=120-111{,}92=8{,}08\).

4) \(4\cdot1{,}125-4{,}5=4{,}5-4{,}5=0\).

\((3{,}54+1{,}324):0{,}76=4{,}864:0{,}76=6{,}4\).

Ответ: 1) 117,08; 2) 73,851268292…; 3) 8,08; 4) 6,4.