1)=(12.918-4.918)+3.4=8+3.4=11.4
2)=(6.403-2.403)+8.715=4+8.715=
=12.715
3)=13.245+(9.88-6.88)=13.245+3=
=16.245
4)=(11.703-2.703)-5.4=9-5.4=3.61)(12,918-4,918)+3,4=8+3,4=11,4
2)(6,403-2,403)+8,715=4+8,715=12,715
3)13,245+(9,88-6,88)=13,245+3=16,245
4)(11,703-2,703)+5,4=9+5,4=14,4