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x+y+z, stiind ca x,y,z aparin R+ si x la a doua + y la a doua + z la a doua= 216 si xy+yz+zx=230 va rog mult :o3 15 PUNCTE


Răspuns :

x+y+z=?
x²+y²+z²= 216
xy+yz+zx=230
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(x+y+z)² = x²+y²+z²+xy+yz+zx= 216+230=446
(x+y+z)²=446=> x+y+z=√446