性质3设n阶方阵A=(a)特征值为1,2，，n,则 (①)+2+…+m=a11+22+…+am 41+2+…+am称为矩阵的迹，fr(A) (2)12…2m=A (3)AH=(a)n特征值为万，万，…，元 f2)=2E-A=(2-2-2)…(2-n) =20-(2+2+…+2n)2-1+…+(-1)”22…2n 20-(a1+2++am)2-1++-IA This docur at is produced by trial version of Print2Flash.Visit www.print2flash.com for mThis document is produced by trial version of Print2Flash. Visit www.print2flash.com for more information