已知二次型f(x1,x2,x3)=(k+1)x21+(k-1)x3+(k-2)x23正定,则数k的取值范围为____.
已知二次型f(x1,x2,x3)=(k+1)x21+(k-1)x3+(k-2)x23正定,则数k的取值范围为____.
【正确答案】:答案为k>2
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