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X+y =200 Y+x=500 X+Z =800
Y,x,z=?


Răspuns :

x+y=200+
y+x=500
x+z=800=
2x+2y+2z=1500|:2
x+y+z=750
x+y+z=750-
x+y=200=
z=550
x+z=800-
z=550=
x=250
y+x=500-
x=250=
y=250
Sper că te-am ajutat!