3.设三阶方阵A=}alpha2gamma_(1)3gamma_(1),已知|A|=6,|B|=1,则|A-B|=____.

3.设三阶方阵$A=\begin{pmatrix}\alpha\\2\gamma_{1}\\3\gamma_{1}\end{pmatrix}$,$B=\begin{pmatrix}\beta\\\gamma_{1}\\\gamma_{1}\end{pmatrix}$,已知|A|=6,|B|=1,则|A-B|=____.

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