Explicação passo-a-passo:
[tex]x + y\\(-15)+(+5 )=\\-15+5= -10\\(+24)+(-4)=\\24 - 4 = 20\\\\(-12)+(-4)=\\-12 - 4 = -16\\\\(-1)+(+0)=\\-1 + 0 = -1[/tex]
[tex]x-y\\\\(-15)-(+5)=\\-15-5=-20\\\\(+24)-(-4)=\\+24+4=+28\\\\(-12)-(-4)=\\-12+4=-8\\\\(-1)-(0)=\\-1-0=-1[/tex]
[tex]x*y\\\\(-15)*(+5)=\\-15*5=-75\\\\(+24)*(-4)=\\+24*-4=-96\\\\(-12)*(-4)=\\-12*-4=+48\\\\(-1)*(0)=\\-1*0=0[/tex]
[tex]x/y\\\\(-15)/(+5)=\\-15/5=-3\\\\(+24)/(-4)=\\+24/-4=-6\\\\(-12)/(-4)=\\-12/-4=+3\\\\(-1)/(0)=\\-1/0=0[/tex]
