摘要： 解:(1)．······························································ (2)将杯口朝上用“上 表示.杯口朝下用“下 表示.画树状图如下: 由上面树状图可知:所有等可能出现的结果共有9种.其中恰好有一个杯口朝上的有6种. ······························································································································ ．

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