Wiedząc że 1791+859=2650 i że 1791-859=932 uzupełnij :
1791+(-859)=......... (-1791)+859=........... (-1791)+(-859)=....... !!!!!
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1791+(-859) =932
(-1791)+859 =-932
(-1791)+(859) =-932
1791+(-859)=932
(-1791)+859=-932
(-1791)+(-859)=-2656