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Stiind ca x+y+z=80
x+y=70
y+z=60
x+z= ?


Răspuns :

x+y+z=80
x+y+z-x+y = Z
80-70=10 =z
x=20
70+z=80
z=80-70
z=10
x+60=80
x=80-60
x=20
x+z=20+10
x+z=30