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3次行列Aの特性値1,1,2 だから|A|=1*1*2=2 AA^*=A^*A=|A|EE 所以A(A^-1+2A^*)=E+2|A|E=(2|A|+1)EE 故|A(A^-1+2A^*)|=|A||A^-1+2A^*|=|5E|=5^3*|E|=125 だから|A^-1+2A^*|=125/|A|=125/2
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