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Aflati 3 numere 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
le adunam
x+y+y+z+x+z=56+88+80
2(x+y+z)=224
x+y+z=224:2
x+y+z=112
z=112-56=56
x=112-88=24
y=112-80=32