1) (12+28)+(56+14)=110
2) (37-17)+(36-26)=30
3) (38-18)+(33-13)+(36-16)+(39-19)=80
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2) 37-17+36-26=20+10=30
3) не знаю, извините
1) (12+28)+(56+14)=110
2) (37-17)+(36-26)=30
3) (38-18)+(33-13)+(36-16)+(39-19)=80