![x = - 1 < y = - 2 < z = + 1 \: find \: the \: vlue \: of \: 3 xy( {x}^{2} + {y}^{2} + {z}^{2} ) x = - 1 < y = - 2 < z = + 1 \: find \: the \: vlue \: of \: 3 xy( {x}^{2} + {y}^{2} + {z}^{2} )](https://tex.z-dn.net/?f=x+%3D++-+1+%26lt%3B+y+%3D++-+2+%26lt%3B+z+%3D++%2B+1+%5C%3A+find+%5C%3A+the+%5C%3A+vlue+%5C%3A+of+%5C%3A+3+xy%28+%7Bx%7D%5E%7B2%7D++%2B++%7By%7D%5E%7B2%7D++%2B++%7Bz%7D%5E%7B2%7D+%29)
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