矩阵A与对焦矩阵相似,则A=
2.2.0
8.2.a
0.0.6
r2-4r1
2.2.0
0.-6.a
0.0.6
A特征值为2.-6.6
|Λ|=2（-6）6=-72
|A|=2（-36-a）=-72=|Λ|
a=0
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