-5,2-(2,6-5,2)=
2,6-5,2=-2.6
-5.2-(-2.6)=-2.6
2)7.4-(2.4-5.5)=2.4-5,5=-3,1
7.4-(-3.1)=10.5
3)8,16 + (2/7 - 10,16) =
2/7 - 10,16=-9 153/175
8.16+(-9 153/175)=
8.16-9 153/175=-1 5/7
4) (3,31 + 5,29) - (3 ,29 - 2,69) =
3,31 + 5,29=8.6
3 ,29 - 2,69=0.6
8.6-0.6=8
5)(4 1/2 + 7 2/7) - (5, 5 + 4 1/7) =
4 1/2 + 7 2/7=11 11/14
5, 5 + 4 1/7=1 5/14
