5,1+8,4-(-5,1)-10,2-(+8,4)-9,8-(-15)=5.2
1)5.1+8.4=13.5
2) 13.5 - (-5.1)=18.6
3)18.6 - 10.2=8.4
4)8.4 - (+8.4)=0
5)0 - 9.8= - 9.8
6) - 9.8 - (-15)= - 9.8+15=5.2
-7,81+9,64-5,32-(+7,81)+(+5,32)-9,64=6.98
1) -7.81+ 9 .64=1.83
2)1.83 - 5.32= - 3.49
3) - 3.49 - (+7.81)=11.3
4)11.3+(+5.32)=16.62
5)16.62 - 9.64=6.98