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A相似于对角矩阵B,即A=T^-1*B*T,所以A^n=T^-1*B^n*T
f(x)=an*x^n+an-1*x^n-1+……+a0
f(B)=an*B^n+an-1*B^n-1+……+a0为对角矩阵
f(A)=an*A^n+an-1*A^n-1+……+a0=an*T^-1*B^n*T+an-1*T^-1*B^n-1*T+……+a0
=T^-1*f(B)*T
f(x)=an*x^n+an-1*x^n-1+……+a0
f(B)=an*B^n+an-1*B^n-1+……+a0为对角矩阵
f(A)=an*A^n+an-1*A^n-1+……+a0=an*T^-1*B^n*T+an-1*T^-1*B^n-1*T+……+a0
=T^-1*f(B)*T
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