• 2022-06-26
    二次型[img=200x28]1803df7c24e461c.png[/img]是正定二次型的充分必要条件是()
    A: 存在n维非零向量X,使[img=86x24]1803df7c2d08fbc.png[/img]
    B: [img=57x25]1803df7c3644bc2.png[/img]
    C: [img=9x23]1803df7c3fa2167.png[/img]的正惯性指数为[img=11x14]1803df7c4844a21.png[/img]
    D: [img=9x23]1803df7c3fa2167.png[/img]的负惯性指数为[img=9x18]1803df7c59bf6a8.png[/img]