设α ,β 为n维列向量,A = E +αβ T ,若β Tα = 2 ,则 A = ______.
人气：227 ℃ 时间：2020-03-10 05:40:20
解答
A = E +αβ T
A α= Eα +αβ Tα
A α= α +α*2=3* α
所以A= 3E
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