1. -152+(-297)=-152-297=-449
2.7,4+(-5,9)=7,4-5,9=1,5
3.-15+2,95=-12,05
4.-145+(-145)=-145-145=-290
5.-0,57+0,75=0,18
6.-1+0,247=-0,753
7.-44,1-(-45)=-44,1+45=0,9
8.20,7+(-5,89)=20,7-5,89=14,81
9.-97-(-97)=-97+97=0
10.-3/4-0,75=-3/4-75/100=-3/4-3/4=-6/4=-3/2=-1 1/2
11.4,25-4 2/5=4 1/4- 4 2/5= 17/4-12/5=85/20-48/20=37/20=1 17/20
12. 1/4+(-1/9)=1/4-1/9=5/36
13.-0,5-(-1/2)=-0,5+1/2=-1/2+1/2=0
14.-7/12+10=113/12=9 1/12