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一个均匀的立方体各面上分别标有数字1,2,3,4,6,8,其表面展开图如图所示,...
一个均匀的立方体各面上分别标有数字1,2,3,4,6,8,其表面展开图如图所示,抛掷这个立方体,则朝上一面的数字恰好等于朝下一面数字的2倍的概率是
.
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