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x+y=700
y+z=500
x+z=800
x,y,z = ?


Răspuns :

700+500+800=2000( 2 Sume )
2000:2=1000 (x+y+z)
x+y+z = 1000
700+z= 1000
z=1000-700
z=300
x+500=1000
x=1000-500
x=500
500+y+300=1000
500+y=1000-300
500+y=700
y=700-500
y=200