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3階方陣A的特徵值為2,-1,0 3階方陣B = 2A^3-5A^2+3E的特徵值為 2*2^3-5*2^2+3=-1,2*(-1)^3-5*(-1)^2+3=-4,2*0^3-5*0^2+3=3, |B| =(-1)(-4)3 = 12
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