设5x12+x22+tx32+4x1x2一2x1x3一2x2x3为正定二次型,则t的取值范围是_________.

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问题 设5x12+x22+tx32+4x1x2一2x1x3一2x2x3为正定二次型,则t的取值范围是_________.

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答案t>2

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