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[" (c) "2 alpha+3 beta+4 gamma],[" 21.Th...

[" (c) "2 alpha+3 beta+4 gamma],[" 21.The system of the equations "kx+y+z=1,x+ky+z],[k,x+y+kz=k^(2)" have no solution,if "k=1,x+ky+z],[" (a) "0" (b) "1],[qquad |b^(2)+c^(2)quad " ab "quad " ac "quad " (d) "-2]

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