Jawabanmu

2014-06-18T16:52:36+07:00
X+y+2z=x+2y+z
y=z

x+2y+z=2x+y+z
x+3z=2x+2z
z=x

x+y+2z=4z=4y=4x=k

z=x=y=1/4k

x²+y²+z²=(k/4)²+(k/4)²+(k/4)²=3/16k²
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