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【简答题】
设RA(x)是A=AH∈Cn×n的Rayleigh商，证明：(1)RA(λx)=Rλ(x)， ， 0≠x∈Cn×n (2)存在0≠xi∈Cn×n(i=1，2，…，n)，使RA(xi)=λi(A)．
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