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x+y =220,x+z=588,y+z=438 afla x,y z

Răspuns :

x+y=220
x+z=588
y+z=438
x=?
y=?
z=?

2x+2y+2z=220+588+438
2(x+y+z)=1246
x+y+z=1246:2
x+y+z=623

z=623-229
z=394

y=438-394
y=44

x=220-44
x=176