要使得二次型f(x1,x2 ,x3)=x12+2tx1x2+x22-2x1x3+

tikufree2019-12-17  4

问题 要使得二次型f(x1,x2 ,x3)=x12+2tx1x2+x22-2x1x3+2x2x3+2x32 为正定的,则t的取值条件是:

选项 A.-10 D.t

答案B

解析[img]/upload/tiku/233/2658676_1.jpg[/img]
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