Find the missing value on the roof of the second house. Each of the numbers on the windows and doors must be used only once and

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问题 Find the missing value on the roof of the second house. Each of the numbers on the windows and doors must be used only once and no number can be reversed.

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答案71

解析 (根据第一个房屋7×12+4=84可推测左边窗户×门+右窗=屋顶,那么第二个屋顶的数值为8×8+7=71。)
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