1)(78628+14539)-(78628-14539)=93157-64089=29068;
2)34680-(49305-19870)=34680-29435=5245
3)(1945+1637)+(1945-1637)=3582+308=3890
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1)(78628+14539)-(78628-14539)=93157-64089=29068;
2)34680-(49305-19870)=34680-29435=5245
3)(1945+1637)+(1945-1637)=3582+308=3890