平行六面体ABCD—A1B1C1D1中,AB=2,AA1=2,AD=1,且AB、AD,AA1夹角都是60°

平行六面体ABCDA1B1C1D1中,AB=2,AA1=2,AD=1,且ABADAA1夹角都是60°,则·= _.

答案

3

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