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Can you find the missing value on the roof of the following house? Each of the numbers on the windows and door must be used only once and no number can be reversed.
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解析：
310=（17+14）×10,即：两个窗户的数字相加再乘以门上的数字，因此很容易算出屋顶上的数字为(12+23)×5=175。
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