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efectuati calculele x+y+z,x+y-z,x-y-z,-x+y-z in fiecare din calculele:
x=2,y=-1,z=3


Răspuns :

2+(-1)+3=2-1+3=4
2+(-1)-3=1-3=-2
2-(-1)-3=3-3=0
-2+(-1)-3=-3-3=-6