18:3.2=5.6
12:3.2=7.3
15:3.2=4.6
7.3 +49=56.3
6.2 +68=74.2
3.8 - 13=-9.2
62-(17 +34) =11
77 - (43 - 16)=50
18 + 57 - 29=46
