设α,β均为3维列向量,已知αβT=1 2 3 4 5 6 7 8 9 ,则αTβ=
问题描述：
设α,β均为3维列向量,已知αβT=1 2 3 4 5 6 7 8 9 ,则αTβ=
答
设α=(a1,a2,a3)T,β=(b1,b2,b3)T,a1b1=1,a2b2=5,a3b3=9,αTβ=a1b1+a2b2+a3b3=1+5+9=15
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