Răspuns:
[tex]x=(-18)+35-21= > x=-4\\\\y=258-87+(-32)= > y=139\\\\x*y=-4*139=-556\\\\x*(-y)=-4*(-139)=556[/tex]
[tex]x=75+13+188= > x=276\\\\y=-103+9-14= > y=-108\\\\xy=276*(-108)=-29808\\\\x*(-y)=276*108=29808[/tex]
[tex]x=63+88-95= > x=56\\\\y=37-96-11= > y=-70\\\\xy=56*(-70)=-3920\\\\x*(-y)=56*70=3920[/tex]
