用正交变换化下列二次型为标准形:f(x,y,z)=x2+4y2+z2-4xy-8xz-4yz ( )
A.5x12+5x22-4x32
B.5x12-5x22-4x32
C.-5x12+5x22-4x32
D.x12+x22
正确答案是A
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