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Aflati trei nr naturale x,y,z stiind ca
x+y=56
y+z=88
x+z=80


Răspuns :

x+y = 56
y+z =88
x+z =80
2x+2y+2z=56+88+80
2x+2y+2z=224
2(x+y+z) =224
    x+y+z =224:2
    x+y+z =112
    x+y=56=> z=112-56=56
    y+z=88=>x=112-88=24
    x+z=80=> y=112-80=32
   x+y=56=> z=112-56=56
    y+z=88=>x=112-88=24 
    x+z=80=> y=112-80=32