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New Roman"'>|。

七、(15分)二次型 经正交变换化为标准形 。求常数a, b 及所用的正交变换矩阵。该二次型是否为正定二次型?

八、(6分)设abg均为三维列向量,A=(abg),B=(bga),且|A|=-2。求|A2B| 。