由特征的定义,Aa1=c1a1;Aa2=c2a2; Aa3=c3a3;
设a1+a2+a3 特征值为c.c(a1+a2+a3) = A(a1+a2+a3) = Aa1+Aa2+Aa3=c1a1+c2a2+c3a3
则 (c-c1)a1+ (c-c2)a2+ (c-c3)a3=0
由a1,a2,a3线性无关,c=c1=c2=c3
由特征的定义,Aa1=c1a1;Aa2=c2a2; Aa3=c3a3;
设a1+a2+a3 特征值为c.c(a1+a2+a3) = A(a1+a2+a3) = Aa1+Aa2+Aa3=c1a1+c2a2+c3a3
则 (c-c1)a1+ (c-c2)a2+ (c-c3)a3=0
由a1,a2,a3线性无关,c=c1=c2=c3