2.设三阶方阵 =[ (alpha )_(1),(alpha )_(2),(alpha )_(3)] 的行列式为 |A|=4, 若令矩阵-|||-=[ (a)_(1)+(a)_(2),2(a)_(2),(a)_(3)-2(a)_(1)] , 则矩阵B的行列式 |B|= __

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