设A为三阶实对称矩阵,满足 (A)=3 , =0, 其中B= 1 -1 1) 1 1、 3 1 0 2 J -|||-((x)_(10),(x)_(2),(x)_(3))=(x)^7Ax.-|||-(1)求正交变换 =0y, 化二次型f为标准形;-|||-(2)求该二次型;-|||-(3)求 ((x)_(1),(x)_(2),(x)_(3))=0 的解.
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