判断下列二次型的正定性.f(x1,x2,x3)=x12+x22+x32-8x1x2-4x2x3+2x1x3.
二次型的矩阵为 A= (1 -4 1 -4 1 -2 1 -2 1) 由于1>0, (1 -4 -4 1) =1-16=-15<0,所以f非正定.
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