1.

: 2 x ^ { 3 } + 2 y ^ { 3 } + 2 z ^ { 3 } - 6 x y z = ( x + y + z ) [ ( x - y ) ^ { 2 } + 1 y - z ^ { 2 } + ( 2 - x ) ^ { 2 } ]

Answer»

wrong it is

prove that is another

Given solution is correct



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