Question

Substitua cada espaço

Answer 1

a) $x=7~~~~~~y=-9~~~~~~z=-4$

$x+y+z=7+(-9)+(-4)=7-9-4=-6$
$x-z=7-(-4)=7+4=11$
$x-z+y=7-(-4)+(-9)=7+4-9=2$

b) $x=-13~~~~~~y=29~~~~~~z=48$

$x+y+z=-13+29+48=64$
$x-z=-13-48=-61$
$x-z+y=-13-48+29=-32$

c) $x=-21~~~~~~y=44~~~~~~z=-33$

$x+y+z=-21+44-33=-10$
$x-z=-21-(-33)=-21+33=12$
$x-z+y=-21-(-33)+44=-21+33+44=56$

d) $x=-10~~~~~~y=20~~~~~~z=47$

$x+y+z=-10+20+47=57$
$x-z=-10-47=-57$
$x-z+y=-10-47+20=-37$