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Find the minimum value of
x2+y2z+z2+x2y+y2+z2x, \frac { { x }^{ 2 }+{ y }^{ 2 } }{ z } +\frac { { z }^{ 2 }+{ x }^{ 2 } }{ y } +\frac { { y }^{ 2 }+{ z }^{ 2 } }{ x }, zx2+y2+yz2+x2+xy2+z2,
subject to x+y+z=2015 x + y + z = 2015 x+y+z=2015 and x,y,z>0 x, y ,z > 0 x,y,z>0.
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