已知alpha_(1),alpha_(2),beta,gamma均为3维列向量，又A=(alpha_(1),alpha_(2),beta)，B=(alpha_(1),alpha_(2),gamma)，若|A|=3,|B|=1, 则|A+2B|=____.

2. 已知$\alpha_{1},\alpha_{2},\beta,\gamma$均为3维列向量，又$A=(\alpha_{1},\alpha_{2},\beta)$，$B=(\alpha_{1},\alpha_{2},\gamma)$，若$|A|=3,|B|=1,$ 则$|A+2B|=$____.

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