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2.-258
3.-82
4. -27
5. -117
6.-2
7. 2
8. -55
2.157-415=-258
3.-37-45=-37+(-45)=-82
4.45+(-72)=45-72=-27
5.-45+(-72)=-117
6.-59-(-57)=-2
7.(-17-(-45))-26=28-26=2
8.(-17-17)+(-21)=(-17+(-17))+(-21)=-34+(-21)=-55
Ok,itu jawabanya sudah aku jawab.........^_~