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afla valorile necunoscute x+y+z=789, x+y=557,y+z=445

Răspuns :

x+y+z=789
x+y=557
y+z=445

z=789-557=232
x=789-445=344
y=789-232-344=213
x+y+z=789
x+y=557
557+z=789/-557
z=232
y+z=445
y+232=445/-232
y=213
x+y=557
x+213=557/-213
x=344